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Subtleties of witnessing quantum coherence in nonisolated systems

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Knee, George C., Marcus, Max, Smith, Luke D. and Datta, Animesh (2018) Subtleties of witnessing quantum coherence in nonisolated systems. Physical Review A, 98 . 052328. doi:10.1103/PhysRevA.98.052328 ISSN 1050-2947.

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Official URL: https://doi.org/10.1103/PhysRevA.98.052328

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Abstract

Identifying nonclassicality unambiguously and inexpensively is a long-standing open challenge in physics. The no-signaling-in-time protocol was developed as an experimental test for macroscopic realism, and serves as a witness of quantum coherence in isolated quantum systems by comparing the quantum state to its completely dephased counterpart. We show that it provides a lower bound on a certain resource-theoretic coherence monotone. We go on to generalize the protocol to the case where the system of interest is coupled to an environment. Depending on the manner of the generalization, the resulting witness either reports on system coherence alone, or on a disjunction of system coherence with either (i) the existence of nonclassical system-environment correlations or (ii) non-negligible dynamics in the environment. These are distinct failure modes of the Born approximation in nonisolated systems.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Quantum systems, Quantum theory
Journal or Publication Title: Physical Review A
Publisher: American Physical Society
ISSN: 1050-2947
Official Date: 21 November 2018
Dates:
DateEvent
21 November 2018Published
21 November 2018Accepted
Volume: 98
Article Number: 052328
DOI: 10.1103/PhysRevA.98.052328
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): © 2018 American Physical Society
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 11 January 2019
Date of first compliant Open Access: 11 January 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDRoyal Commission for the Exhibition of 1851http://dx.doi.org/10.13039/501100000700
EP/K04057X/2[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
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