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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
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Official URL: https://doi.org/10.1103/PhysRevA.98.052328
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 | |||||||||
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| Subjects: | Q Science > QC Physics | |||||||||
| Divisions: | Faculty of 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: |
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| Date of first compliant deposit: | 11 January 2019 | |||||||||
| Volume: | 98 | |||||||||
| Article Number: | 052328 | |||||||||
| DOI: | 10.1103/PhysRevA.98.052328 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Publisher Statement: | © 2018 American Physical Society | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| RIOXX Funder/Project Grant: |
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