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dc.contributor.authorZhuang, Quntao
dc.contributor.authorPirandola, Stefano
dc.date.accessioned2021-04-02T19:51:35Z
dc.date.available2021-04-02T19:51:35Z
dc.date.issued2020-08
dc.identifier.citationZhuang, Q., & Pirandola, S. (2020). Ultimate limits for multiple quantum channel discrimination. Physical Review Letters, 125(8), 080505.
dc.identifier.issn0031-9007
dc.identifier.pmid32909798
dc.identifier.doi10.1103/PhysRevLett.125.080505
dc.identifier.urihttp://hdl.handle.net/10150/657389
dc.description.abstractQuantum hypothesis testing is a central task in the entire field of quantum information theory. Understanding its ultimate limits will give insight into a wide range of quantum protocols and applications, from sensing to communication. Although the limits of hypothesis testing between quantum states have been completely clarified by the pioneering works of Helstrom in the 1970s, the more difficult problem of hypothesis testing with quantum channels, i.e., channel discrimination, is less understood. This is mainly due to the complications coming from the use of input entanglement and the possibility of employing adaptive strategies. In this Letter, we establish a lower limit for the ultimate error probability affecting the discrimination of an arbitrary number of quantum channels. We also show that this lower bound is achievable when the channels have certain symmetries. As an example, we apply our results to the problem of channel position finding, where the goal is to identify the location of a target channel among multiple background channels. In this general setting, we find that the use of entanglement offers a great advantage over strategies without entanglement, with nontrivial implications for data readout, target detection, and quantum spectroscopy.
dc.language.isoen
dc.publisherAMER PHYSICAL SOC
dc.rights© The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleUltimate Limits for Multiple Quantum Channel Discrimination
dc.typeArticle
dc.typetext
dc.identifier.eissn1079-7114
dc.contributor.departmentUniv Arizona, Dept Elect & Comp Engn
dc.contributor.departmentUniv Arizona, James C Wyant Coll Opt Sci
dc.identifier.journalPHYSICAL REVIEW LETTERS
dc.description.noteOpen access article
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
dc.eprint.versionFinal published version
dc.source.journaltitlePHYSICAL REVIEW LETTERS
refterms.dateFOA2021-04-02T19:51:35Z


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© The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.
Except where otherwise noted, this item's license is described as © The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.