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BEGIN:VEVENT
SUMMARY:Probe incompatibility in multiparameter noisy quantum metrology
DTSTART;VALUE=DATE-TIME:20211014T150500Z
DTEND;VALUE=DATE-TIME:20211014T153000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-374@cern.ch
DESCRIPTION:Speakers: Francesco Albarelli (University of Warwick)\nWe deri
ve fundamental bounds on the maximal achievable precision in multiparamete
r noisy quantum metrology\, tighter than a direct use of single-parameter
results. This allows us to study the effect of incompatibility of optimal
probe states for simultaneous estimation of multiple parameters in generic
channels\, so far studied mostly in noiseless scenarios. We apply our res
ults to several paradigmatic example\, such as lossy multiple-phase interf
erometry.\nGoing beyond the multiparameter estimation paradigm\, we introd
uce the concept of random quantum sensing and show how the tools developed
may be applied to multiple-channel discrimination. As an illustration\, w
e prove the loss of the quadratic advantage of time-continuous Grover algo
rithm in presence of dephasing or erasure noise.\n\nhttps://indico.unina.i
t/event/52/contributions/374/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/374/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Atom-photon bound states in an array of high-impedance superconduc
ting resonators
DTSTART;VALUE=DATE-TIME:20211014T121000Z
DTEND;VALUE=DATE-TIME:20211014T123500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-401@cern.ch
DESCRIPTION:Speakers: Simone Gasparinetti (Chalmers University of Technolo
gy)\nEngineering the electromagnetic environment of a quantum emitter give
s rise to a plethora of exotic light-matter interactions. In particular\,
photonic lattices can seed long-lived atom-photon bound states inside phot
onic band gaps. We report on the implementation of a novel microwave archi
tecture consisting of an array of high-impedance superconducting resonator
s forming a 1 GHz-wide pass band\, in which we have embedded two frequency
-tuneable artificial atoms. We study the atom-field interaction and access
previously unexplored coupling regimes\, in both the single- and double-e
xcitation subspace. In addition\, we demonstrate coherent interactions bet
ween two atom-photon bound states\, in both resonant and dispersive regime
s. The presented architecture holds promise for quantum simulation with tu
neable-range interactions and experiments in nonlinear photon transport. R
eference: arXiv:2107.06852\n\nhttps://indico.unina.it/event/52/contributio
ns/401/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/401/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Machine Learning
DTSTART;VALUE=DATE-TIME:20211014T100000Z
DTEND;VALUE=DATE-TIME:20211014T102500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-387@cern.ch
DESCRIPTION:Speakers: Filippo Caruso (Dipartimento di Fisica e Astronomia\
, Università degli Studi di Firenze)\nQuantum Machine Learning (QML) is w
here nowadays machine learning is going to meet quantum information scienc
e in order to realize more powerful quantum technologies. In particular\,
several QML schemes can arise according to the fact that the data to be pr
ocessed and the algorithm processing them can be either classical or quant
um. Moreover\, the learning algorithms can be unsupervised\, supervised an
d goal-oriented (reinforcement learning). Here\, we will discuss our recen
t theoretical and experimental results focusing on quantum embedding\, qua
ntum state discrimination\, noise sensing\, quantum generative adversarial
networks\, and quantum reinforcement learning. QML is expected to provide
huge advantages over its classical counterpart\, and deeper investigation
s are timely needed since they can be already tested on the commercially a
vailable quantum devices.\n\nhttps://indico.unina.it/event/52/contribution
s/387/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/387/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum estimation reaching for the continuum
DTSTART;VALUE=DATE-TIME:20211012T123000Z
DTEND;VALUE=DATE-TIME:20211012T125500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-429@cern.ch
DESCRIPTION:Speakers: Marco Barbieri (Università Roma Tre\, Italy)\nWe d
iscuss two experimental results on the problem of quantum estimation appli
ed to functions. We illustrate quantum function estimation of the phase re
sponse of a liquid crystal employing both quantum and classical resources\
, providing evidence of the superiority of the former strategy. Including
function estimation in the toolkit of quantum metrology opens up opportuni
ties for quantum enhancement in problems such as evaluating time-dependent
signals and mapping fields. The second experiment concerns semiparametric
methods applied to the frequency two-photon wavefunction\, based on Hong-
Ou-Mandel interferometry. Tools from classical statistics and quantum esti
mation have shown their usefulness in analysing and engineering metrologic
al schemes based on Hong-Ou-Mandel interference: we expect that advanced s
tatistical methods will bring further insights.\n\nhttps://indico.unina.it
/event/52/contributions/429/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/429/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unconventional superconducting devices and designs for quantum arc
hitectures
DTSTART;VALUE=DATE-TIME:20211012T094500Z
DTEND;VALUE=DATE-TIME:20211012T101000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-411@cern.ch
DESCRIPTION:Speakers: Davide Massarotti (Università Federico II)\nWe will
report on special properties of smart superconducting circuits and of hyb
rid tunnel-ferromagnetic Josephson junctions (JJs) on how to engineer the
macroscopic phase in quantum circuits.\n\nThe possibility to control and d
rive tunnel-ferromagnetic JJs through different physical means allows for
novel tuning mechanisms that are not susceptible to specific noise sources
in a transmon configuration. Moreover\, digital control based on classica
l superconducting ultra-low power electronics is being adapted to perform
qubit control and readout for scalable architectures in this linked digita
l-quantum hybrid system. In this framework\, we will discuss how the macro
scopic phase of carefully designed superconducting circuits can be manipul
ated to perform digital phase detection of weak coherent radiation\, thus
constituting a phase-readout protocol for a superconducting qubit.\n\nhttp
s://indico.unina.it/event/52/contributions/411/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/411/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Integrated quantum photonics in femtosecond-laser-written devices
DTSTART;VALUE=DATE-TIME:20211015T092000Z
DTEND;VALUE=DATE-TIME:20211015T094500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-403@cern.ch
DESCRIPTION:Speakers: Roberto Osellame (IFN-CNR)\nIntegrated photonics is
a key enabler for quantum technologies\, with significant improvements int
roduced in quantum computing\, sensing and communications. Femtosecond las
er writing of photonic circuits brings key advantages in terms of unpreced
ented 3D circuit layouts\, possibility to manipulate polarization encoding
\, multimaterial devices and rapid prototyping. All these advantages are
widely exploited in integrated quantum photonics applications and a few ex
amples will be reviewed in this presentation. Progress towards the specifi
c goal of developing a complete quantum photonic platform encompassing all
the relevant functionalities will be discussed.\n\nhttps://indico.unina.i
t/event/52/contributions/403/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/403/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dressed emitters as impurities
DTSTART;VALUE=DATE-TIME:20211013T132000Z
DTEND;VALUE=DATE-TIME:20211013T134500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-438@cern.ch
DESCRIPTION:Speakers: Luca Leonforte (Università degli studi di Palermo)\
nHere\, we present a compact formulation of the resolvent-based theory for
calculating atom-photon dressed states built on the idea that the atom be
haves as an effective impurity *(i)*. This establishes an explicit connect
ion with the standard impurity problem in condensed matter. When the impur
ity reduces to a vacancy\, the resulting class of dressed states play a ce
ntral role in the emerging area of topological quantum optics *(ii)* in th
at any topologically-robust dressed state is a VDS *(iii)*.\n\n*(i)* L. Le
onforte\, D. Valenti\, B. Spagnolo\, A. Carollo\, F. Ciccarello\, arXiv:21
08.11963\n\n*(ii)* M. Bello\, G. Platero\, J. I. Cirac\, and A. González-
Tudela\, Sci. Adv. 5\, eaaw0297 (2019)\n\n*(iii)* L. Leonforte\, A. Caroll
o\, F. Ciccarello\, PRL 126\, 063601 (2021)\n\nhttps://indico.unina.it/eve
nt/52/contributions/438/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/438/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Single-shot simulations of prolonged quantum dynamics with structu
red light
DTSTART;VALUE=DATE-TIME:20211015T083000Z
DTEND;VALUE=DATE-TIME:20211015T085500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-436@cern.ch
DESCRIPTION:Speakers: Francesco Di Colandrea (Università degli Studi di N
apoli Federico II)\nStandard photonic simulations of lattice quantum dynam
ics rely on our ability to shape optical modes and their relative coupling
s. In these platforms\, reproducing temporally-long evolutions is challeng
ing\, as required setups are complex and lossy. Here we report the realiza
tion of long-time photonic quantum walks\, based on light propagation thro
ugh a limited number of birefringent optical elements. The walk is enginee
red in the particles quasi-momentum space\, encoded into a spatial coordin
ate transverse to the optical axis. Considering optical polarization as th
e internal degree of freedom\, the evolution operator is built in terms of
a spatially-varying polarization transformation\, realized through liquid
-crystal metasurfaces. We report up to 320 timesteps of quantum-walk evolu
tions\, even affected by disorder\, far beyond state-of-the-art simulation
s of such dynamics.\n\nhttps://indico.unina.it/event/52/contributions/436/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/436/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QTs\, sfide ed opportunità nei Piani Nazionali di sviluppo: il p
unto di vista delle imprese
DTSTART;VALUE=DATE-TIME:20211013T093000Z
DTEND;VALUE=DATE-TIME:20211013T104500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-435@cern.ch
DESCRIPTION:https://indico.unina.it/event/52/contributions/435/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/435/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QTs\, sfide ed opportunità nei Piani Nazionali di sviluppo: il p
unto di vista delle imprese
DTSTART;VALUE=DATE-TIME:20211013T070000Z
DTEND;VALUE=DATE-TIME:20211013T090000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-434@cern.ch
DESCRIPTION:https://indico.unina.it/event/52/contributions/434/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/434/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Observation of Larmor precession of a single spin in a semiconduct
or quantum dot
DTSTART;VALUE=DATE-TIME:20211012T125500Z
DTEND;VALUE=DATE-TIME:20211012T132000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-378@cern.ch
DESCRIPTION:Speakers: Dario Alessandro Fioretto (Centre de Nanosciences et
Nanotechnologies (C2N)\, CNRS\, Université Paris Saclay)\nIn semiconduct
or quantum dots\, the spin of a confined charge carrier\, whether electron
or hole\, attracted a lot of interest since spin-polarized optical transi
tions enable the efficient generation of spin-photon and photon-photon ent
anglement. This could be extended to generate multi-photon entangled state
s\, which are building blocks for quantum technologies such as measurement
-based quantum computing.\nIn this work\, we exploit a phonon-assisted\, o
ff-resonant excitation scheme that enables access to the polarization degr
ee of freedom to probe the spin dynamics\, whilst maintaining efficient si
ngle-photon generation and high purity. We demonstrate that we can address
the spin-selective transitions\, observing the Larmor precession of a sin
gle-hole spin around an in-plane magnetic field\, opening the route toward
s an efficient generation of polarization-encoded multi-photon entangled s
tates.\n\nhttps://indico.unina.it/event/52/contributions/378/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/378/
END:VEVENT
BEGIN:VEVENT
SUMMARY:There is only one time
DTSTART;VALUE=DATE-TIME:20211011T125500Z
DTEND;VALUE=DATE-TIME:20211011T132000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-375@cern.ch
DESCRIPTION:Speakers: Alessandro Cuccoli (Università di Firenze - Diparti
mento di Fisica)\nWe draw a picture of physical systems allowing us to rec
ognize what is the thing we call ”time”. Elements of the picture are t
wo non-interacting\, entangled quantum systems: one acting as a clock\, an
d the other one as the evolving system. The setting is based on the ”Pag
e and Wootters mechanism”\, with tools from Lie-Group and large-N quantu
m approaches. The theoretical framework\, based on a parametric representa
tion with generalized coherent states\, allows us to take the classical li
mit either of the clock only\, or of the clock and the evolving system\; w
e derive the Schrödinger equation in the first case\, and Hamilton's equa
tions in the second one\, showing that there is only one time\, that is a
manifestation of entanglement.\n\nhttps://indico.unina.it/event/52/contrib
utions/375/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/375/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Closing
DTSTART;VALUE=DATE-TIME:20211015T152000Z
DTEND;VALUE=DATE-TIME:20211015T153000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-433@cern.ch
DESCRIPTION:https://indico.unina.it/event/52/contributions/433/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/433/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantifying the difference between many-body quantum states
DTSTART;VALUE=DATE-TIME:20211015T143000Z
DTEND;VALUE=DATE-TIME:20211015T145500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-432@cern.ch
DESCRIPTION:Speakers: Davide Girolami (Politecnico di Torino)\nThe quantum
state fidelity is the textbook measure of the difference between two quan
tum states. Yet\, it is inadequate to compare the complex configurations o
f many-body systems. We introduce the weighted distances\, a new class of
information-theoretic measures that overcome these limitations. They quant
ify how hard it is to discriminate\nbetween two quantum states of many par
ticles\, factoring in the structure of the required measurement apparatus.
We also show that the newly defined “weighted Bures length” between t
he input and output states of a quantum process is a lower bound to the ex
perimental cost of the transformation. The result uncovers\nan exact quant
um limit to our ability to convert physical resources into computational o
nes.\nRef.: PRL 126\, 170502 (2021)\n\nhttps://indico.unina.it/event/52/co
ntributions/432/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/432/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Remote Phase Sensing by Coherent Single Photon Addition
DTSTART;VALUE=DATE-TIME:20211011T084500Z
DTEND;VALUE=DATE-TIME:20211011T091000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-370@cern.ch
DESCRIPTION:Speakers: Marco Bellini (Istituto Nazionale di Ottica CNR-INO)
\nIn this work\, we introduce a new kind of nonlocal interferometer based
on the delocalized addition of a single photon onto distinct field modes.
Since the quantum state produced by this conditional operation strongly de
pends on the phase set in a physically-separated heralding station\, we pr
opose and experimentally demonstrate a remote phase estimation technique\,
characterized by a sensitivity that scales with the intensity of light th
at never interacted with a distant sample.\n\nhttps://indico.unina.it/even
t/52/contributions/370/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/370/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum speed-ups in reinforcement learning
DTSTART;VALUE=DATE-TIME:20211011T100000Z
DTEND;VALUE=DATE-TIME:20211011T102500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-372@cern.ch
DESCRIPTION:Speakers: Valeria Saggio (University of Vienna)\nWithin artifi
cial intelligence\, of particular interest is reinforcement learning (RL)\
, where autonomous agents learn to accomplish tasks via feedback exchange
with their environment (the world they interact with). Thanks to rapid adv
ances in quantum technologies\, the idea of using quantum physics to boost
the performance of RL agents was developed. I will focus on the bridge be
tween RL and quantum mechanics\, and show that a reduction in the agent’
s learning time is possible if agents and environments also interact quant
um-mechanically[1]. This idea was implemented on a fully-tunable photonic
processor. The achieved speed-up in learning time\, compared to the fully
classical picture\, confirms the potential of quantum technologies for fut
ure RL applications.\n\n[1] Saggio\, V. et al. Nature 591\, 229–233 (202
1).\n\nhttps://indico.unina.it/event/52/contributions/372/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/372/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A multimode framework to describe photon subtraction operation
DTSTART;VALUE=DATE-TIME:20211011T093500Z
DTEND;VALUE=DATE-TIME:20211011T100000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-371@cern.ch
DESCRIPTION:Speakers: Mohamed Faouzi MELALKIA (Institut de Physique de Nic
e (INPHYNI) - Université Côte d'Azur - CNRS UMR 7010)\nOptical non-Gauss
ian quantum states can be generated in a heralded manner by applying a pho
ton subtraction operation to a Gaussian input state. In our work\, we deve
lop a theoretical framework to describe this operation in the case where t
he input state is spectrally multimode. This framework allows the optimal
design of photon subtraction experiments. We give the exact expression of
the generated non-Gaussian state in the general case. We apply this framew
ork to the case of Schrodinger kitten state generation using a multimode s
queezed vacuum as input state. We show that the quality of the generated s
tate (in terms of fidelity and Wigner function negativity) can be enhanced
by adapting the different experimental parameters.\n\nhttps://indico.unin
a.it/event/52/contributions/371/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/371/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized coherence vector: definition and applications
DTSTART;VALUE=DATE-TIME:20211015T145500Z
DTEND;VALUE=DATE-TIME:20211015T152000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-430@cern.ch
DESCRIPTION:Speakers: Gustavo Martin Bosyk (Università degli Studi di Cag
liari & Instituto de Física La Plata - CONICET)\nA notion of coherence ve
ctor of a general quantum state is introduced on the framework of quantum
coherence resource theory [1]. This generalized\ncoherence vector complete
ly characterizes the notions of being incoherent\, as well as being maxima
lly coherent. Moreover\, using this notion and the majorization relation\,
a necessary condition for the conversion of general quantum states by mea
ns of incoherent operations is obtained. Finally\, a new family of coheren
ce monotones based on the coherence vector is introduced.\n\n[1] G.M. Bosy
k\, *et al.*\, Phys. Rev. A 103\, 012403 (2021)\n\nhttps://indico.unina.it
/event/52/contributions/430/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/430/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetry resolved entanglement
DTSTART;VALUE=DATE-TIME:20211015T140500Z
DTEND;VALUE=DATE-TIME:20211015T143000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-418@cern.ch
DESCRIPTION:Speakers: Pasquale Calabrese ()\nEntanglement and symmetries a
re two pillars of modern physics. Surprisingly\, only in very recent times
the interplay between these two fundamental concepts became the theme of
an intense research activity merging together notions and ideas from quant
um information\, quantum field theory\, quantum optics\, holography\, many
-body condensed matter\, and many more. In this talk\, I will review some
of the more interesting findings for symmetry resolved entanglement rangin
g from purely field theoretical ones to microscopical lattice models for d
isordered systems. The focus of the talk will be on the results and outloo
ks rather than on the the technical derivations.\n\nhttps://indico.unina.i
t/event/52/contributions/418/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/418/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transient dynamics in Rydberg-EIT
DTSTART;VALUE=DATE-TIME:20211015T131500Z
DTEND;VALUE=DATE-TIME:20211015T134000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-417@cern.ch
DESCRIPTION:Speakers: Roberto Tricarico (Università degli studi di Napoli
Federico II)\nEnsembles of Rydberg atoms\, in the Electromagnetic Induced
Transparency \nsetup\, have proved to be a possible route to obtain photo
n-photon \nnonlinear interaction. Thanks to the Rydberg blockade \nmechani
sm\, a single \nphoton is indeed able to saturate the atomic \nresponse of
a considerably large portion of the \nensemble\, that appears opaque to a
second \nincoming one. While the continuous wave (CW) response \nof such
a medium was largely studied in the past\, \nhere we present the analysis
of the pulse dynamics. We show that the transient light can be more antibu
nched than the CW one\, and how this could pave the way to the development
of new protocols to turn light from classical into quantum.\n\nhttps://in
dico.unina.it/event/52/contributions/417/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/417/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Variational Quantum Eigensolver for SU(N) Fermions
DTSTART;VALUE=DATE-TIME:20211015T125000Z
DTEND;VALUE=DATE-TIME:20211015T131500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-416@cern.ch
DESCRIPTION:Speakers: Mirko Consiglio (Department of Physics\, University
of Malta)\nVariational quantum algorithms aim at harnessing the power of n
oisy intermediate-scale quantum computers\, by using a classical optimizer
to train a parameterized quantum circuit to solve tractable quantum probl
ems. The variational quantum eigensolver is one of the aforementioned algo
rithms designed to determine the ground-state of many-body Hamiltonians. H
ere\, we apply the variational quantum eigensolver to study the ground-sta
te properties of $N$-component fermions. With such knowledge\, we study th
e persistent current of interacting SU($N$) fermions\, which is employed t
o reliably map out the different quantum phases of the system. Our approac
h lays out the basis for a current-based quantum simulator of many-body sy
stems that can be implemented on noisy intermediate-scale quantum computer
s.\n\nhttps://indico.unina.it/event/52/contributions/416/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/416/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Bose-Einstein condensate in holographically-generated optical tr
aps
DTSTART;VALUE=DATE-TIME:20211015T121000Z
DTEND;VALUE=DATE-TIME:20211015T125000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-415@cern.ch
DESCRIPTION:Speakers: Donatella Cassettari (University of St Andrews)\nWe
simulate the preparation of a superposition of vortex states in a Bose-Ein
stein condensate trapped in a ring geometry. It has been proposed that a v
ortex-antivortex superposition can be used as an inertial sensor\, e.g. to
measure rotations\, or as a magnetic field sensors [1\,2]. In both cases\
, the external influence causes a precession of the BEC standing wave\, wh
ich can be measured experimentally. In this talk I will show how computer-
generated holography [3] can be used for the efficient preparation of thes
e states\, and I will demonstrate their stability by simulating their subs
equent evolution.\n\n[1] S. Thanvanthri et_al.\, Journal of Modern Optics
59\,1180(2012).\n\n[2] G Pelegrí et_al.\, New J.Phys. 20\,103001(2018). \
n\n[3] D. Bowman et_al.\, Opt.Express 25\,11692(2017).\n\nhttps://indico.u
nina.it/event/52/contributions/415/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/415/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Speeding up quantum annealing: schedule engineering and optimal dr
iving
DTSTART;VALUE=DATE-TIME:20211015T103500Z
DTEND;VALUE=DATE-TIME:20211015T110000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-414@cern.ch
DESCRIPTION:Speakers: Gianluca Passarelli (CNR-SPIN Napoli)\nShortcuts to
adiabaticity in adiabatic quantum computation can be realized either by op
timal designs of the annealing schedules or by using external control fiel
ds\, such as counterdiabatic (CD) driving operators. I will discuss how ge
netic algorithms can help in determining optimal annealing schedules. Seco
ndly\, I will introduce the variational approach to CD driving in closed q
uantum systems to build approximate CD operators\, satisfying locality con
straints. Finally\, I will discuss a generalization of the variational app
roach to open quantum systems.\n\n 1. P. R. Hegde\, GP\, A. Scocco\, P. Lu
cignano\, arXiv:2108.03185 (2021)\n 2. GP\, V. Cataudella\, R. Fazio\, P.
Lucignano\, PRResearch 2\, 013283 (2020)\n 3. GP\, R. Fazio\, P. Lucignano
\, arXiv:2109.13043 (2021)\n\nhttps://indico.unina.it/event/52/contributio
ns/414/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/414/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Trapped ions for hybrid quantum systems
DTSTART;VALUE=DATE-TIME:20211015T101000Z
DTEND;VALUE=DATE-TIME:20211015T103500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-413@cern.ch
DESCRIPTION:Speakers: Lucia Duca (INRiM / LENS)\nUltracold atoms and trapp
ed ions have proven to be valuable resources for getting new insights on f
undamental physical phenomena. Trapped ions can be individually addressed
and coherently manipulated. Ultracold gases\, instead\, provide large atom
ic samples where trapping potentials and interactions are controlled exter
nally\, making them well suited for systematic studies of many-body quantu
m phenomena. An atom-ion hybrid system brings together the advantages of e
ach physical system and provides an ideal platform to investigate fundamen
tal quantum mechanics\, like localized impurities in a Fermi gas. Here we
present the first step towards the realization of such hybrid system: the
trapping of Ba ions\, together with the current state of advancement of th
e apparatus that will allow us to reach coherent atom-ion coupling.\n\nhtt
ps://indico.unina.it/event/52/contributions/413/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/413/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fundamental thresholds of realistic quantum error correction circu
its from classical spin models
DTSTART;VALUE=DATE-TIME:20211015T094500Z
DTEND;VALUE=DATE-TIME:20211015T101000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-412@cern.ch
DESCRIPTION:Speakers: Davide Vodola ()\nMapping quantum error correcting c
odes to classical statistical mechanics models has proven a powerful tool
to study the fundamental error thresholds of quantum error correcting code
s under phenomenological noise models. In this work\, we extend this mappi
ng to realistic faulty quantum circuits by deriving the associated strongl
y correlated classical spin models for the example of a quantum repetition
code. We then use Monte-Carlo simulations to study the resulting phase di
agram of the associated interacting spin model and benchmark our results a
gainst a minimum-weight perfect matching decoder. The presented method pro
vides an avenue to assess the fundamental thresholds of QEC codes and asso
ciated readout circuitry\, independent of specific decoding strategies\, a
nd can thereby help guiding the development of near-term QEC hardware.\n\n
https://indico.unina.it/event/52/contributions/412/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/412/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Underground tests of Quantum Mechanics: Collapse Models and Pauli
Exclusion Principle
DTSTART;VALUE=DATE-TIME:20211015T080500Z
DTEND;VALUE=DATE-TIME:20211015T083000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-410@cern.ch
DESCRIPTION:Speakers: Catalina Oana Curceanu (INFN-LNF)\nWe are experiment
ally investigating possible departures from the standard quantum mechanics
’ predictions at the Gran Sasso underground laboratory in Italy.\n In p
articular\, we are searching signals predicted by the collapse models whic
h were proposed to solve the “measurement problem” in quantum physics.
\nI shall discuss our recent results published in Nature Physics\, where
we ruled out the natural parameter-free version of the gravity-related col
lapse model. I shall then present more generic results on testing CSL col
lapse models and discuss future perspectives.\nFinally\, I shall briefly p
resent the VIP experiment with which we look for possible violations of th
e Pauli Exclusion Principle by searching for “impossible” atomic trans
itions and comment the impact of this research in relation to Quantum Grav
ity models.\n\nhttps://indico.unina.it/event/52/contributions/410/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/410/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Witnessing Bell violations through probabilistic negativity
DTSTART;VALUE=DATE-TIME:20211015T074000Z
DTEND;VALUE=DATE-TIME:20211015T080500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-409@cern.ch
DESCRIPTION:Speakers: Benjamin Morris (University of Nottingham)\nBell's t
heorem shows that no hidden-variable model can explain the measurement sta
tistics of a quantum system shared between two parties\, thus ruling out a
classical (local) understanding of nature. In this work we demonstrate th
at by relaxing the positivity restriction in the hidden-variable probabili
ty distribution it is possible to derive quasiprobabilistic Bell inequalit
ies whose sharp upper bound is written in terms of a negativity witness of
said distribution. This provides an analytic solution for the amount of n
egativity necessary to violate the CHSH inequality by an arbitrary amount\
, therefore revealing the amount of negativity required to emulate the qua
ntum statistics in a Bell test.\n\nhttps://indico.unina.it/event/52/contri
butions/409/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/409/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entangling solid-state quantum repeater nodes
DTSTART;VALUE=DATE-TIME:20211015T070000Z
DTEND;VALUE=DATE-TIME:20211015T074000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-427@cern.ch
DESCRIPTION:Speakers: Hughes de Riedmatten (ICFO)\nEntangling solid-state
quantum repeater nodes\n\nhttps://indico.unina.it/event/52/contributions/4
27/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/427/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Device-independent certification of quantum technologies
DTSTART;VALUE=DATE-TIME:20211014T144000Z
DTEND;VALUE=DATE-TIME:20211014T150500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-408@cern.ch
DESCRIPTION:Speakers: Iris Agresti (La Sapienza university of Rome)\nWith
the development of quantum technologies\, it is pivotal to discern devices
exploiting quantum phenomena from faulty ones. This essential task is elu
sive\, since eventual imperfections may go unnoticed to a direct verificat
ion. A solution to this deadlock exploits the discrepancies between classi
cal and quantum causal predictions\, which can detect nonclassical correla
tions\, with no assumptions on the apparatus (device-independently). This
talk will present two demonstrations of this approach\, applied to instrum
ental processes and experimentally implemented on photonic platforms. Firs
tly\, nonclassical correlations will be revealed through the violation of
an inequality constraint and used to bound the randomness of a bit string.
Then\, a novel and more general approach will be adopted\, exploiting the
quantification of causal influence between two variables.\n\nhttps://indi
co.unina.it/event/52/contributions/408/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/408/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological multiterminal superconducting systems
DTSTART;VALUE=DATE-TIME:20211014T141500Z
DTEND;VALUE=DATE-TIME:20211014T144000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-407@cern.ch
DESCRIPTION:Speakers: Gianluca Rastelli (CNR-INO Trento)\nMultiterminal Jo
sephson junctions (MJJs) constitute engineered topological systems. In [1]
we studied the properties of Andreev states in a circuit with a quantum d
ot (QD) coupled to superconducting leads (SCs) and demonstrated that the q
uantum geometric tensor can be extracted by synthetically polarized microw
aves. In [2] we investigated a linear chain of QDs connected to SCs and sh
owed that nontrivial topology appears beyond a threshold value of the nonl
ocal proximity-induced pairing potential. Finally we demonstrated such sys
tems can implement higher-dimensional topological systems (second Chern nu
mber) and admit non-Abelian Berry phase [3].\n\n[1] R. Klees et al.\, PRL
124\, 197002 (2020).\n\n[2] R. L. Klees et al.\, PRB 103\, 014516 (2021).\
n\n[3] H. Weisbrich et al.\, PRX Quantum 2\, 010310 (2021).\n\nhttps://ind
ico.unina.it/event/52/contributions/407/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/407/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coherent and dissipative dynamics at quantum phase transitions
DTSTART;VALUE=DATE-TIME:20211014T135000Z
DTEND;VALUE=DATE-TIME:20211014T141500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-406@cern.ch
DESCRIPTION:Speakers: Davide Rossini (University of Pisa\, Pisa\, Italy)\n
I will present a dynamic scaling theory aimed at addressing the out-of-equ
ilibrium behavior of many-body systems in proximity of quantum phase trans
itions of any order. This can be obtained by extending the equilibrium sca
ling laws ruled either by the critical exponents at continuous transitions
\, or by the energy gap of the lowest levels at first-order transitions. I
will also discuss some aspects related to the effects of dissipative mech
anisms\, highlighting a nontrivial competition that may arise between the
coherent dynamics at quantum transitions and some non-unitary perturbation
s\, such as the coupling with an external Markovian bath or to a quantum-m
easurement apparatus.\n\nhttps://indico.unina.it/event/52/contributions/40
6/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/406/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Genuine multipartite nonlocality with collective postselection str
ategies
DTSTART;VALUE=DATE-TIME:20211014T130000Z
DTEND;VALUE=DATE-TIME:20211014T132500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-405@cern.ch
DESCRIPTION:Speakers: Valentin Gebhart (CNR-INO)\nIn the certification of
(genuine multipartite) nonlocality\, measured data are often postselected
to purify the nonlocal features of the data. However\, if this postselecti
on requires communication between the measurement parties\, it can potenti
ally create fake correlations that mimic nonlocal features via the postsel
ection bias. Here\, we show that certain postselection strategies that req
uire partial communication between the parties\, are valid to certify the
presence of genuine multipartite nonlocality between all parties. The resu
lts are proven by the use of causal diagrams and the no-signalling princip
le. Finally\, the results are applied to an optical setup to demonstrate t
he creation of genuine three-partite nonlocality from independent photon s
ources.\n\nhttps://indico.unina.it/event/52/contributions/405/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/405/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum hypothesis testing for exoplanet detection
DTSTART;VALUE=DATE-TIME:20211014T123500Z
DTEND;VALUE=DATE-TIME:20211014T130000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-404@cern.ch
DESCRIPTION:Speakers: Zixin Huang (Macquarie University)\nDetecting the fa
int emission of a secondary source in the proximity of the much brighter o
ne has been the most severe obstacle for using direct imaging in searching
for exoplanets. Using quantum state discrimination and quantum imaging te
chniques\, we show that one can significantly reduce the probability of er
ror for detecting the presence of a weak secondary source\, especially the
y are closely separated. If the weak source has intensity $\\epsilon \\ll
1 $ relative to the bright source\, we find that the error exponent can be
improved by a factor of $1/\\epsilon$. We find linear-optical measurement
s optimal in this regime. Our result serves as a complementary method in t
he toolbox of imaging\, with applications ranging from astronomy to micros
copy.\n\nhttps://indico.unina.it/event/52/contributions/404/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/404/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QFold: A Quantum Metropolis Optimization Algorithm
DTSTART;VALUE=DATE-TIME:20211014T092000Z
DTEND;VALUE=DATE-TIME:20211014T100000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-428@cern.ch
DESCRIPTION:Speakers: Miguel Ángel Martín-Delgado (Universidad Complute
nse de Madrid)\nQFold: A Quantum Metropolis Optimization Algorithm\n\nhttp
s://indico.unina.it/event/52/contributions/428/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/428/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Measurement induced topological entanglement transition in a free
fermion model
DTSTART;VALUE=DATE-TIME:20211014T102500Z
DTEND;VALUE=DATE-TIME:20211014T105000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-402@cern.ch
DESCRIPTION:Speakers: Alessandro Romito (Lancaster University)\nQuantum me
asurements have been recently exploited as a tool to induce e phase transi
tion between volume- and area-law scaling of entanglement entropy. For fre
e fermions\, the transition occurs between sub-volume (logarithmic) and ar
ea-law scaling.\nHere we present a free fermion model where two sets of no
n-commuting measurements induce a transition between area-law entanglement
scaling phases of distinct topological order. We find numerically that\,
in the presence of unitary dynamics\, the two topological phases are separ
ated by a sub-volume scaling region and that the transition universality c
lass differs from that of interactive models with projective measurements.
We further show that the different phases are qualitatively captured by a
n analytically tractable non-Hermitian Hamiltonian model obtained via part
ial post-selection.\n\nhttps://indico.unina.it/event/52/contributions/402/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/402/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mesoscopic twin-beam states propagating through noisy and lossy ch
annels for novel Quantum Communication protocols
DTSTART;VALUE=DATE-TIME:20211014T083000Z
DTEND;VALUE=DATE-TIME:20211014T085500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-400@cern.ch
DESCRIPTION:Speakers: Alessia Allevi (University of Insubria\, Como)\nQuan
tum states of light represent a useful tool for encoding and transmitting
information. \nThe main obstacle to the successful implementation of commu
nication protocols\, especially over long distances\, is given by the loss
es and noise sources affecting the transmission channels\, which can irrev
ersibly change the statistical properties of the employed nonclassical sta
tes of light.\nAt variance with the usual schemes\, based on single-photon
quantum states\, in our work we show that mesoscopic twin-beam states exh
ibit very good robustness to both losses and noise sources.\nThis result s
uggests the implementation of novel communication protocols based on twin-
beam states in which information is encoded in noise superimposed on the q
uantum states and losses simulate an eavesdropper’s interference.\n\nhtt
ps://indico.unina.it/event/52/contributions/400/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/400/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the properties of the asymptotic incompatibility measure in mul
ti-parameter quantum estimation
DTSTART;VALUE=DATE-TIME:20211014T080500Z
DTEND;VALUE=DATE-TIME:20211014T083000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-419@cern.ch
DESCRIPTION:Speakers: Alessandro Candeloro (University of Milan)\nIn multi
parameter quantum metrology\, asymptotic incompatibility (AI) is a recentl
y introduced measure quantifying the quantumness of statistical models. St
arting from its definition\, we found that it is possible to set an upper
bound on the maximum number of asymptotic compatible parameters in the sta
tistical model. We numerically investigate the AI for the full tomography
of $d$-dimensional quantum systems ($2 < d \\leq 4$). Using exponential co
ordinates\, numerical results suggest that\, once we fix the spectrum of t
he corresponding Hamiltonian\, the AI measure is a function of the fictiti
ous temperature $\\beta$ only. In addition\, the maximum number of asympto
tic compatible parameters is a function of the dimension $d$. We conjectur
e that these results are valid for any finite dimension $d$.\n\nhttps://in
dico.unina.it/event/52/contributions/419/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/419/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Advancements on QKD networking in space and on the ground
DTSTART;VALUE=DATE-TIME:20211014T074000Z
DTEND;VALUE=DATE-TIME:20211014T080500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-399@cern.ch
DESCRIPTION:Speakers: Francesco Vedovato (University of Padova)\nRecent cy
ber-attacks to national networks have highlighted the importance of develo
ping an Italian cybersecurity infrastructure where QKD could play an impor
tant role by enabling the generation of secure cryptographic keys. The Qua
ntumFuture group is involved in various research projects (eg.\, OPENQKD)
aimed at developing fully-functioning and innovative QKD systems able to o
perate in the existing fiber telecommunication networks. Moreover\, free-s
pace ground-to-ground links and satellite channels will be an integral par
t of future quantum networks\, and we are working on the inter-modal imple
mentation of free-space and fiber links. An overview of the QKD methods de
veloped by QuantumFuture will be given\, as well as a presentation of the
recent results obtained in field-trials over the Padua network will be pre
sented.\n\nhttps://indico.unina.it/event/52/contributions/399/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/399/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Virtual photons in ultra-strongly coupled systems or Quantum Nonli
near Optics without Photons
DTSTART;VALUE=DATE-TIME:20211014T070000Z
DTEND;VALUE=DATE-TIME:20211014T074000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-368@cern.ch
DESCRIPTION:Speakers: Franco Nori (RIKEN and University of Michigan)\nThe
talk will begin with a very quick pedagogical overview of cavity QED\, cir
cuit QED\, and the ultra-strong coupling limit of these. Afterwards\, pres
ent some more recent results\, in the context of quantum nonlinear optics
of qubits and resonators\, coupled in various different configurations\, a
nd these qubits and resonators exchanging energy in various ways.\n\nhttps
://indico.unina.it/event/52/contributions/368/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/368/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement detection in Noisy Intermediate-Scale Quantum devices
DTSTART;VALUE=DATE-TIME:20211013T125500Z
DTEND;VALUE=DATE-TIME:20211013T132000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-394@cern.ch
DESCRIPTION:Speakers: Vittorio Vitale (SISSA)\nWith the recent advent of n
oisy intermediate-scale quantum devices implemented in various platforms\,
entanglement and quantum coherence detection are in the focus of interest
. We propose an ordered set of experimentally accessible conditions for de
tecting entanglement in mixed states. The k-th condition involves comparin
g moments of the partially-transposed density operator up to order k. Our
empirical studies highlight that the first four conditions already detect
mixed state entanglement reliably in a variety of architectures. Exploitin
g symmetries can help to further improve their detection capabilities. We
also show how to estimate moment inequalities based on local random measur
ements of single state copies (classical shadows). We illustrate the metho
d by applying it to a variety of physical systems and to experimental data
.\n\nhttps://indico.unina.it/event/52/contributions/394/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/394/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light-Matter interactions in synthetic magnetic fields: Landau-Pho
ton polaritons
DTSTART;VALUE=DATE-TIME:20211013T143500Z
DTEND;VALUE=DATE-TIME:20211013T150000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-398@cern.ch
DESCRIPTION:Speakers: Daniele De Bernardis (BEC-CNR-INFM and Dipartimento
di Fisica\, Università di Trento\, I-38050 Povo\, Italy and)\nWe study li
ght-matter interaction in two dimensional photonic systems in the presence
of a spa- tially homogeneous synthetic magnetic field for light. Specific
ally\, we consider one or more two-level emitters located in the bulk regi
on of the lattice\, where for increasing magnetic field the photonic modes
change from extended plane waves to circulating Landau levels. This chang
e has a drastic effect on the resulting emitter-field dynamics\, which bec
omes intrinsically non-Markovian and chiral\, leading to the formation of
strongly coupled Landau-photon polaritons. The peculiar dynamical and spec
tral properties of these quasi-particles can be probed with state-of-the-a
rt photonic lattices in the optical and the microwave domain and may find
various applications for the quantum simulation of strongly interacting to
pological models.\n\nhttps://indico.unina.it/event/52/contributions/398/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/398/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Few- and many-body photon bound states in quantum nonlinear media
DTSTART;VALUE=DATE-TIME:20211013T141000Z
DTEND;VALUE=DATE-TIME:20211013T143500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-397@cern.ch
DESCRIPTION:Speakers: Giuseppe Calajo (ICFO)\nThe emergence of multi-photo
n bound states is an intriguing phenomenon that can occur in quite differe
nt quantum nonlinear media\, such as arrays of quantum emitters coupled to
photonic waveguides and Rydberg atomic ensembles. \nTo theoretical study
these bound states within an unified framework\n we propose a spin-model f
ormulation of quantum atom-light interactions. We solve the few- and many-
body correlated dynamics of such states\, investigating how their propagat
ing properties within the media manifest themselves in the spatio-temporal
correlations of the output field. For sufficiently large photon number we
recover a classical soliton-like behavior that suggests that a quantum-to
-classical transition from quantum bound states to classical solitons is a
general property inherent to quantum nonlinear media.\n\nhttps://indico.u
nina.it/event/52/contributions/397/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/397/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exotic interactions mediated by a non-Hermitian photonic bath
DTSTART;VALUE=DATE-TIME:20211013T134500Z
DTEND;VALUE=DATE-TIME:20211013T141000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-396@cern.ch
DESCRIPTION:Speakers: Federico Roccati (Università degli Studi di Palermo
)\nWe study the exotic interaction between emitters mediated by the photon
ic modes of a lossy photonic lattice described by a non-Hermitian Hamilton
ian\, where structured losses can seed exotic emission properties. Photon
s can mediate dissipative\, fully non-reciprocal\, interactions between em
itters with range critically dependent on the loss rate. At the bare-latti
ce exceptional point\, the effective couplings are exactly nearest-neighbo
ur\, implementing a dissipative\, fully non-reciprocal\, Hatano-Nelson mod
el. Counter-intuitively\, this occurs irrespective of the lattice boundary
conditions. Thus photons can mediate an effective emitters’ Hamiltonian
which is translationally-invariant despite the fact that the field is not
. We interpret these effects in terms of metastable atom-photon dressed st
ates\, which can be exactly localized on only two lattice cells or extende
d across the entire lattice.\n\nhttps://indico.unina.it/event/52/contribut
ions/396/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/396/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum decay at short\, intermediate\, and long times: Observatio
n in integrated photonics
DTSTART;VALUE=DATE-TIME:20211013T123000Z
DTEND;VALUE=DATE-TIME:20211013T125500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-393@cern.ch
DESCRIPTION:Speakers: Francesco Pepe ()\nThe decay of an unstable system i
s usually described by an exponential law. However\, quantum mechanics gen
erally predicts deviations from the exponential at both short and long tim
es. The latter case\, in which a power-law decay is predicted\, is particu
larly elusive\, as its onset commonly occurs when the survival probability
is heavily depleted. We describe a hopping model on a semi-infinite array
\, in which a power-law quantum decay can be observed. We report the exper
imental observation non-exponential decay dynamics\, including power-law r
egimes\, in arrays of parallel single-mode optical waveguides\, fabricated
by femtosecond laser direct inscription. We finally comment on the featur
es of state propagation in the array\, highlighting the behavior of wavefr
onts.\n\nhttps://indico.unina.it/event/52/contributions/393/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/393/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Single Microwave Photon Detection with Josephson Junctions for Axi
on Search: First Tests
DTSTART;VALUE=DATE-TIME:20211012T143500Z
DTEND;VALUE=DATE-TIME:20211012T150000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-373@cern.ch
DESCRIPTION:Speakers: Fabio Chiarello (CNR-IFN)\nThe fast development of q
uantum technologies based on superconducting devices is particularly impor
tant for the search of light dark matter\, such as Axions and Axion-like p
articles\, where it is required the efficient detection of single microwav
e photons with low dark-count rates. We present SIMP\, an experiment for t
he axion search based on the use of a current biased Josephson junction de
tector\, and discuss the experimental results obtained with a first test s
ystem.\n\nhttps://indico.unina.it/event/52/contributions/373/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/373/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement in indistinguishable particle systems
DTSTART;VALUE=DATE-TIME:20211012T141000Z
DTEND;VALUE=DATE-TIME:20211012T143500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-391@cern.ch
DESCRIPTION:Speakers: Ugo Marzolino (INFN\, Trieste)\, Fabio Benatti (Univ
ersità di Trieste)\nFor distinguishable particles\, there exists an agree
d upon notion of entanglement based on the possibility of addressing indiv
idually each particle. Instead\, the indistinguishability hinders their in
dividual addressability and has prompted diverse\, discordant definitions
of entanglement. I will present a formulatiom of emtamglement in terms of
correlation functions\, that provides a general setting to discuss non-loc
al effects. I will focus on the following general criteria: i) entanglemen
t corresponds to non-local correlations\; ii) when\, by "freezing" suitabl
e degrees of freedom\, identical particles can be effectively distinguishe
d\, entanglement must reduce to the standard notion\; iii) entanglement is
a resource for quantum information protocols. These requests are satisfie
d by the so-called mode-entanglement theory which accounts for correlation
s between physical modes rather than particles.\n\nhttps://indico.unina.it
/event/52/contributions/391/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/391/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement recovery and state robustness via spatial deformation
of identical particle wave functions
DTSTART;VALUE=DATE-TIME:20211012T134500Z
DTEND;VALUE=DATE-TIME:20211012T141000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-390@cern.ch
DESCRIPTION:Speakers: Matteo Piccolini (Università degli Studi di Palermo
)\nWe discuss the problem of entanglement protection against surrounding n
oise by a procedure suitably exploiting spatial indistinguishability of id
entical subsystems. To this purpose\, we take two initially separated and
entangled identical qubits interacting with two independent noisy environm
ents. Three typical models of environments are considered: the amplitude d
amping channel\, the phase damping channel and the depolarizing channel. A
fter the interaction\, we deform the qubits wave functions to make them sp
atially overlap before performing spatially localized operations and class
ical communication (sLOCC). By computing the concurrence of the resulting
state we show that this protocol partially recovers the spoiled entangleme
nt thanks to the induced spatial indistinguishability. A general behavior
emerges: the higher the indistinguishability achieved\, the larger the amo
unt of recovered correlations.\n\nhttps://indico.unina.it/event/52/contrib
utions/390/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/390/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coherent Manipulation and Readout of Molecular Spins through Plana
r Superconducting Microwave Resonators
DTSTART;VALUE=DATE-TIME:20211012T132000Z
DTEND;VALUE=DATE-TIME:20211012T134500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-376@cern.ch
DESCRIPTION:Speakers: Claudio Bonizzoni (Istituto Nanoscienze CNR NANO S3
di Modena)\nMolecular spins hold potential for quantum information when in
tegrated into planar superconducting microwave resonators [\\[AdvPhysX3\,1
435305(2018)\\]][1]. Along this line\, we present our recent results on de
veloping protocols (i.e. microwave sequences) for initializing\, manipulat
ing and reading out molecular spin ensembles. We first apply a storage/ret
rieval protocol on an Oxovanadyl (VO(TPP)) sample\, showing that it’s po
ssible to use it as a memory for individually-controllable pulses [\\[NPJQ
uantInf6\,68(2020)\\]][2]. We then demonstrate an advanced transmission sp
ectroscopy on a crystal of Diphenyl-Nitroxide (DPNO) in the dispersive lim
it of the coupling with the resonator\, where no resonant exchange of phot
ons occurs [\\[AdvQuantTech2100039(2021)\\]][3]. Finally\, we shall presen
t our preliminary results on applying a Machine Learning approach in recog
nising and treating spin echo signals.\n\n [1]: https://www.tandfonline.c
om/doi/full/10.1080/23746149.2018.1435305\n [2]: https://www.nature.com/a
rticles/s41534-020-00296-9\n [3]: https://onlinelibrary.wiley.com/doi/10.
1002/qute.202100039\n\nhttps://indico.unina.it/event/52/contributions/376/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/376/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal rectification through a nonlinear quantum resonator
DTSTART;VALUE=DATE-TIME:20211012T103500Z
DTEND;VALUE=DATE-TIME:20211012T110000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-389@cern.ch
DESCRIPTION:Speakers: Elisabetta Paladino (Dipartimento di Fisica e Astron
omia\, Università di Catania)\nWe present a systematic study of thermal r
ectification\, R\, in a nonlinear resonator. In the strongly anharmonic re
gime and weak system-bath coupling we derive general upper bounds on R. Be
yond the weak-coupling regime we employ different methods: (i) including c
otunneling processes\, using (ii) nonequilibrium Green’s function formal
ism and (iii) Feynman-Vernon path integral approach. We find that the weak
coupling bounds are violated for strong coupling\, providing signatures o
f high-order coherent processes. For weaker anharmonicity heat rectificati
on is calculated with the equation of motion method and in mean-field appr
oximation. We find that the former method predicts\, for small or intermed
iate anharmonicity larger R.\n\nB. Bhandari\, P. A. Erdman\, R. Fazio\, E.
Paladino and F. Taddei Phys. Rev. B 103\, 155434 (2021)\n\nhttps://indico
.unina.it/event/52/contributions/389/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/389/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor network algorithms for high-dimensional quantum many-body s
ystems
DTSTART;VALUE=DATE-TIME:20211012T101000Z
DTEND;VALUE=DATE-TIME:20211012T103500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-388@cern.ch
DESCRIPTION:Speakers: Simone Montangero ()\nWe review some recent results
on the development of tensor network algorithms and their application to\n
high-dimensional many-body quantum systems and machine learning problems i
n High Energy Physics. In particular\, we present results on\ntopological
two-dimensional systems\, two dimensional Rydberg atom systems\, and two a
nd three-dimensional lattice gauge theories in presence of fermonic matter
.\nFinally\, we present their application to LHCb event classification and
to the study of open many-body quantum systems\, specifically to the comp
utation of the\nentanglement of formation in critical many-body quantum sy
stems at finite temperature.\n\nhttps://indico.unina.it/event/52/contribut
ions/388/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/388/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robust engineering of universal Gaussian cluster states for contin
uous variable measurement-based quantum computation
DTSTART;VALUE=DATE-TIME:20211012T092000Z
DTEND;VALUE=DATE-TIME:20211012T094500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-426@cern.ch
DESCRIPTION:Speakers: David Vitali (Università di Camerino)\nWe first sho
w that any Gaussian cluster state of N bosonic modes can be generated by a
multi-mode squeezing transformation. and provide the explicit recipe. We
then use this result to show that a large class of pure entangled CV Gauss
ian states\, including 2D-cluster states\, can be robustly generated as a
unique steady state of a dissipative dynamics employing minimal resources.
In fact\, this is achievable using only a single-site squeezed driving an
d passive bilinear interactions. We provide the explicit protocol which co
rresponds to the engineering of a suitable excitation number conserving Ha
miltonian.This fact can be used for the implementation of universal contin
uous variable measurement-based-quantum computation on various platforms.\
n\nhttps://indico.unina.it/event/52/contributions/426/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/426/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New applications of twin beams: from quantum reading to quantum co
nformance test
DTSTART;VALUE=DATE-TIME:20211012T083000Z
DTEND;VALUE=DATE-TIME:20211012T085500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-386@cern.ch
DESCRIPTION:Speakers: MARCO GENOVESE (inrim)\nWe present quantum reading [
3] realisation\, describing theoretically and experimentally\, as that qua
ntum advantage is obtained by practical photon-counting measurements combi
ned with a simple maximum-likelihood decision [4]\, demonstrating that qua
ntum entanglement and simple optics are able to enhance the readout of dig
ital data.\nThen we consider [5] a protocol on conformance test. We formu
late the problem in the context of quantum hypothesis demonstrating that q
uantum resources\, namely twin beams [1\,2]\, and a simple receive are abl
e to outperform any classical strategy in recognizing whether or not a cer
tain quantum channel conforms to a reference one.\n[1] M.Genovese\,J.Opt.1
8 (2016) 073002.\n[2] M.Genovese\, arXiv2101.02891\n[3] S. Pirandola\, PRL
106\, 090504 (2011).\n[4] G.Ortolano et al. Sci.Adv.(2021) 7\, eabc7796.\n
[5] G.Ortolano et al.arXiv:2012.15282\n\nhttps://indico.unina.it/event/52/
contributions/386/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/386/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the detection of quantum light in the mid-infrared
DTSTART;VALUE=DATE-TIME:20211012T080500Z
DTEND;VALUE=DATE-TIME:20211012T083000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-385@cern.ch
DESCRIPTION:Speakers: Natalia Bruno (Istituto Nazionale di Ottica (CNR-INO
)\, Largo Enrico Fermi 6\, 50125 Florence\, Italy & European Laboratory fo
r Non-linear Spectroscopy (LENS)\, Via nello Carrara 1\, 50019 Sesto Fiore
ntino\, Florence\, Italy)\nQuantum Cascade Laser (QCL) frequency combs cou
ld emit nonclassical light and multimode entanglement thanks to a third or
der nonlinearity that allows for Four Wave Mixing in the device (Faist 201
6)\, which makes them ideal candidates for free-space communication applic
ations.\nHowever\, in the mid-infrared\, the lack of efficient and low-noi
se detectors compromises enormously the ability to investigate non classic
al features of light. In addition\, the laser gain of the device itself ca
n introduce noise due to the amplification. Having a signature of non clas
sical light\, such as squeezing\, is a challenging task in these condition
s. We demonstrate the possibility of investigating continuous-variable qua
ntum physics in the mid-infrared through a novel Balanced Homodyne Detecto
r (Gabbrielli 2021)\, tested with QCLs.\n\nhttps://indico.unina.it/event/5
2/contributions/385/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/385/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A hybrid classical-quantum approach to improve Q-learning
DTSTART;VALUE=DATE-TIME:20211012T074000Z
DTEND;VALUE=DATE-TIME:20211012T080500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-384@cern.ch
DESCRIPTION:Speakers: Francesco Plastina (Dip. Fisica UNICAL - INFN Gruppo
Collegato di Cosenza)\nA classical-quantum hybrid approach to computation
is presented\, allogwing for a (quadratic) performance improvement in the
learning stage of a neural network. In particular\, a quantum computing r
outine is described\, which helps to prepare/update the probability distri
butions that drive the agent operations. This algorithm can be used not on
ly in a reinforcement learning scenario\, but also in several other contex
ts. After intrudicing the algorithm and presenting a formal evaluation of
its performance (in terms of required qubits\, number of required operatio
ns\, and maximum approximation error)\, the way it can be exploited in a r
einforcement learning set-up is discussed in details.\n\nhttps://indico.un
ina.it/event/52/contributions/384/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/384/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Energy Lines and the optimal output ergotropy problem
DTSTART;VALUE=DATE-TIME:20211012T071500Z
DTEND;VALUE=DATE-TIME:20211012T074000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-383@cern.ch
DESCRIPTION:Speakers: Salvatore Tirone (Scuola Normale Superiore)\nWe stud
y the possibility of conveying useful energy (work) along a transmission
line that allows for a partial preservation of quantum coherence. As a fig
ure of merit we adopt the maximum values that ergotropy\, total ergotrop
y\, and non-equilibrium free-energy attain at the output of the line for a
n assigned input energy threshold. When the system can be modelled in term
s of Phase-Invariant Bosonic Gaussian Channels (BGCs)\, we show that coher
ent inputs are optimal. For generic BGCs which are not Phase-Invariant the
problem becomes more complex and coherent inputs are no longer optimal. I
n this case\, focusing on one-mode channels\, we solve the optimization pr
oblem under the extra restriction of Gaussian input signals.\n\nhttps://in
dico.unina.it/event/52/contributions/383/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/383/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Optimal energy conversion through anti-adiabatic driving
DTSTART;VALUE=DATE-TIME:20211012T065000Z
DTEND;VALUE=DATE-TIME:20211012T071500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-369@cern.ch
DESCRIPTION:Speakers: Giuliano Benenti (Dip. Scienze Alta Tecnologia\, Uni
v. Insubria\, Como\, Italy)\nA key question for the development of quantum
thermos-machines and more generally of quantum technologies is what are t
he ultimate bounds to the performance of heat engines. We have shown [1] t
hat in the antiadiabatic limit a periodically driven isothermal heat engin
e can approach the ideal (unit) energy conversion efficiency with finite o
utput power and vanishingly small relative power fluctuations. The simulta
neous realization of all three desiderata of a heat engine is possible tha
nks to the breaking of time-reversal symmetry. Moreover\, non-Markovian dy
namics\, obtained by suitably engineering the bath\, can further improve t
he power-efficiency trade-off.\n\n[1] L. M. Cangemi\, M. Carrega\, A. De C
andia\, V. Cataudella\, G. De Filippis\, M. Sassetti\, and G. Benenti\, Ph
ys. Rev. Res. ***3***\, 013237 (2021).\n\nhttps://indico.unina.it/event/52
/contributions/369/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/369/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement between remote ions interfaced with cavities
DTSTART;VALUE=DATE-TIME:20211011T143500Z
DTEND;VALUE=DATE-TIME:20211011T150000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-382@cern.ch
DESCRIPTION:Speakers: Maria Galli (University of Innsbruck)\nIn a quantum
network\, entanglement between qubits located in remote nodes is a fundame
ntal resource for different applications including distributed quantum com
puting and quantum repeaters. Once can generate entanglement between dista
nt ions by creating an ion-photon entangled pair at each of the two networ
k nodes\, steering the photons to opposite ports of a beamsplitter\, and s
ubsequently detect them. Specific photon detection patterns herald the gen
eration of the ion-ion entangled state.\nTwo remote ions have previously b
een entangled over a separation of a few meters. Here\, we present entang
lement generation between ions stored in remote nodes in separate building
s in Innsbruck\, connected via a fiber link of 400 m\, where the trapped i
ons are interfaced with optical cavities.\n\nhttps://indico.unina.it/event
/52/contributions/382/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/382/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thouless pumping of photons
DTSTART;VALUE=DATE-TIME:20211011T141000Z
DTEND;VALUE=DATE-TIME:20211011T143500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-381@cern.ch
DESCRIPTION:Speakers: Valentina Brosco (Istituto dei Sistemi Complessi\, C
NR and Physics Department\, Università di Roma "La Sapienza")\nNon-abelia
n gauge fields emerge naturally in the description of adiabatically evolvi
ng quantum systems. In this talk we show that they also play a role in Tho
uless pumping in the presence of degenerate bands. Specifically\, we consi
der a photonic Lieb lattice and show that when the lattice parameters are
slowly modulated\, the propagation of the photons bear the fingerprints of
the underlying non-abelian gauge structure. \nThe non-dispersive characte
r of the bands enables a high degree of control on photon propagation. Our
work paves the way to the generation and detection of non-abelian gauge f
ields in photonic and optical lattices. The talk includes a review of abe
lian pumping in photonic and superconducting systems and perspectives on q
uantum applications of photonic pumps.\n\nhttps://indico.unina.it/event/52
/contributions/381/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/381/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the notion of causal influence
DTSTART;VALUE=DATE-TIME:20211011T134500Z
DTEND;VALUE=DATE-TIME:20211011T141000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-380@cern.ch
DESCRIPTION:Speakers: Paolo Perinotti (Università di Pavia)\nWe address t
he question whether a reversible transformation produces a causal influenc
e from one of its input systems to one of its outputs. In quantum theory c
ausal influence is typically identified with signalling. A second notion i
s borrowed from the theory of quantum cellular automata. We adopt an exten
sion of the latter\, in the context of general probabilistic theories. We
show that in the quantum case the two notions coincide\, while in classica
l theory they are different. Following the proof of equivalence in the qua
ntum case\, we identify a general condition under which the two definition
s coincide\, i.e. "no interaction without disturbance". We show an algebra
ic construction that is useful for the analysis of causal influence in rev
ersible processes.\n\nhttps://indico.unina.it/event/52/contributions/380/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/380/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum gravitational decoherence
DTSTART;VALUE=DATE-TIME:20211011T132000Z
DTEND;VALUE=DATE-TIME:20211011T134500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-379@cern.ch
DESCRIPTION:Speakers: Luciano Petruzziello (University of Salerno & INFN -
National Institute for Nuclear Physics)\nWe discuss a decoherence process
due to quantum gravity effects. We assume a foamy quantum spacetime with
a fluctuating minimal length coinciding on average with the Planck scale.
Considering deformed canonical commutation relations with a fluctuating de
formation parameter\, we derive a Lindblad master equation that yields loc
alization in energy space and decoherence times consistent with the availa
ble observational evidence. Finally\, we comment on possible experimental
tests based on cavity optomechanics setups with ultracold massive molecula
r oscillators and provide preliminary estimates on the values of the physi
cal parameters needed for actual laboratory implementations\n\nhttps://ind
ico.unina.it/event/52/contributions/379/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/379/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The four postulates of quantum mechanics are three
DTSTART;VALUE=DATE-TIME:20211011T123000Z
DTEND;VALUE=DATE-TIME:20211011T125500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-377@cern.ch
DESCRIPTION:Speakers: Lorenzo Maccone (Universita' di Pavia)\nThe tensor p
roduct postulate of quantum mechanics states that the Hilbert space of a c
omposite system is the tensor product of the components' Hilbert spaces. A
ll current formalizations of quantum mechanics that do not contain this po
stulate contain some equivalent postulate or assumption (sometimes hidden)
. Here we give a natural definition of composite system as a set containin
g the component systems and show how one can logically derive the tensor p
roduct rule from the state postulate and from the measurement postulate. I
n other words\, our paper reduces by one the number of postulates necessar
y to quantum mechanics.\n\nThis talk is based on the paper: \nG.Carcassi\,
L.Maccone\,C.A.Aidala\, The four postulates of quantum mechanics are three
\, Phys. Rev. Lett. 126\, 110402 (2021).\n\nhttps://indico.unina.it/event/
52/contributions/377/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/377/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum information from spacetime dynamics
DTSTART;VALUE=DATE-TIME:20211011T091000Z
DTEND;VALUE=DATE-TIME:20211011T093500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-431@cern.ch
DESCRIPTION:Speakers: Orlando Luongo (University of Camerino)\nQuantum inf
ormation from spacetime dynamics\n\nhttps://indico.unina.it/event/52/contr
ibutions/431/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/431/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Improving quantum teleportation with a quantum dot-based entangled
photon source
DTSTART;VALUE=DATE-TIME:20211011T102500Z
DTEND;VALUE=DATE-TIME:20211011T105000Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-392@cern.ch
DESCRIPTION:Speakers: Francesco Basso Basset (Sapienza University of Rome)
\nAll-optical quantum teleportation relies on properties of entangled stat
es that\, in the prospect of operation in quantum networks\, should be enc
oded on photon pairs on demand. Quantum dots are a promising solution\, as
shown in recent multi-photon experiments [1].\nHere\, we demonstrate quan
tum teleportation with quantum dot photons achieving improved protocol fid
elity [2]. The experimental results are predicted based on entanglement fi
delity and photon indistinguishability. The Bell state measurement impleme
ntation and spectral filtering are investigated within the same model. Fin
ally\, we envision the next steps towards realization with remote nodes.\n
[1] F. Basso Basset\, M. Rota\, C. Schimpf\, D. Tedeschi\, et al.\, Phys.
Rev. Lett. 123\, 160501 (2019).\n[2] F. Basso Basset.\, et al.\, npj Quant
um Inf. 7\, 7 (2021).\n\nhttps://indico.unina.it/event/52/contributions/39
2/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/392/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening
DTSTART;VALUE=DATE-TIME:20211011T083000Z
DTEND;VALUE=DATE-TIME:20211011T084500Z
DTSTAMP;VALUE=DATE-TIME:20230604T034859Z
UID:indico-contribution-52-422@cern.ch
DESCRIPTION:https://indico.unina.it/event/52/contributions/422/
LOCATION:
URL:https://indico.unina.it/event/52/contributions/422/
END:VEVENT
END:VCALENDAR