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SUMMARY:Probe incompatibility in multiparameter noisy quantum metrology
DTSTART;VALUE=DATE-TIME:20211014T150500Z
DTEND;VALUE=DATE-TIME:20211014T153000Z
DTSTAMP;VALUE=DATE-TIME:20260314T135505Z
UID:indico-contribution-88-374@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/
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BEGIN:VEVENT
SUMMARY:Device-independent certification of quantum technologies
DTSTART;VALUE=DATE-TIME:20211014T144000Z
DTEND;VALUE=DATE-TIME:20211014T150500Z
DTSTAMP;VALUE=DATE-TIME:20260314T135505Z
UID:indico-contribution-88-408@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/
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BEGIN:VEVENT
SUMMARY:Topological multiterminal superconducting systems
DTSTART;VALUE=DATE-TIME:20211014T141500Z
DTEND;VALUE=DATE-TIME:20211014T144000Z
DTSTAMP;VALUE=DATE-TIME:20260314T135505Z
UID:indico-contribution-88-407@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/
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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:20260314T135505Z
UID:indico-contribution-88-406@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/
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