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DTSTAMP:20260405T054135Z
UID:1716282000@ist.ac.at
DTSTART:20240521T110000
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DESCRIPTION:Speaker: Borivoje Dakić\nhosted by Johannes Fink\nAbstract: As
  quantum technologies advance\, the ability to engineer increasingly large
  quantum devices has experienced rapid development. In this context\, veri
 fying large entangled systems represents one of the main challenges in emp
 loying such systems for reliable quantum information processing. Though th
 e most complete technique is undoubtedly full tomography\, the inherent ex
 ponential increase of experimental and post-processing resources with syst
 em size makes this approach infeasible at even moderate scales. For this r
 eason\, there is currently an urgent need to develop novel methods that su
 rpass these limitations. In this talk\, I will review novel techniques [1]
  that enable efficient verification with a fixed number of resources (samp
 ling complexity) and thus prove suitable for systems of arbitrary dimensio
 n. Specifically\, a probabilistic framework for single-copy for entangleme
 nt detection and few-copy device-independent quantum state verification is
  reviewed. I will also present the selective quantum state tomography meth
 od\, which enables estimating off-diagonal elements of an unknown density 
 matrix with several copies independently of the system’s size. These hyp
 er-efficient techniques define a dimension demarcation for partial tomogra
 phy and open a path for novel applications. References [1] J. Morris\, V
 . Saggio\, A. Goanin and B. Daki\, Quantum Verification and Estimation wit
 h Few Copies\, Adv. Quantum Technol. 2100118 (2022)\, https://doi.org/10.1
 002/qute.202100118.
LOCATION:Heinzel Seminar Room / Ground Floor / Office Building West\, ISTA
ORGANIZER:sandra.widdmann@ista.ac.at
SUMMARY:Borivoje Dakić: Quantum verification with few copies
URL:https://talks-calendar.ista.ac.at/events/4716
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