Hunt, Matthew A., Lerner, Igor V., Yurkevich, Igor V. and Gefen, Yuval (2019). How to observe and quantify quantum-discord states via correlations. Physical Review A, 100 (2),
Abstract
Quantum correlations between parts of a composite system most clearly reveal themselves through entanglement. Designing, maintaining, and controlling entangled systems is very demanding, which raises the stakes for understanding the efficacy of entanglement-free, yet quantum correlations, exemplified by quantum discord. Discord is defined via conditional mutual entropies of parts of a composite system and its direct measurement is hardly possible even via full tomographic characterization of the system state. Here we design a simple protocol to detect and quantify quantum discord in an unentangled bipartite system. Our protocol relies on a characteristic of discord that can be extracted from repeated direct measurements of certain correlations between subsystems of the bipartite system. The proposed protocol opens a way of extending experimental studies of discord to electronic systems, but can also be implemented in quantum-optical systems.
Publication DOI: | https://doi.org/10.1103/PhysRevA.100.022321 |
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Divisions: | College of Engineering & Physical Sciences |
Funding Information: | This work was supported by the Leverhulme Trust Grants No. RPG-2016-044 (I.V.Y.), No. VP1-2015-005 (I.V.Y., Y.G.), the Italia-Israel project QUANTRA (Y.G.), and the DFG within the network CRC TR 183, C01 (Y.G.). The authors (I.V.L., I.V.Y., and Y.G.) are |
Additional Information: | © 2019 The American Physical Society |
Uncontrolled Keywords: | Atomic and Molecular Physics, and Optics |
Publication ISSN: | 1094-1622 |
Last Modified: | 30 Sep 2024 12:09 |
Date Deposited: | 02 Sep 2019 08:14 |
Full Text Link: |
https://arxiv.o ... /abs/1901.11514 |
Related URLs: |
http://www.scop ... tnerID=8YFLogxK
(Scopus URL) https://journal ... RevA.100.022321 (Publisher URL) |
PURE Output Type: | Article |
Published Date: | 2019-08-16 |
Accepted Date: | 2019-01-27 |
Authors: |
Hunt, Matthew A.
Lerner, Igor V. Yurkevich, Igor V. ( 0000-0003-1447-8913) Gefen, Yuval |