BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Probe incompatibility in multiparameter noisy quantum metrology DTSTART;VALUE=DATE-TIME:20211014T150500Z DTEND;VALUE=DATE-TIME:20211014T153000Z DTSTAMP;VALUE=DATE-TIME:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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:20260310T123329Z 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