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Diagonal quantum discord [PDF]

open access: yesJ. Phys. A: Math. Theor. 52, 135301 (2019), 2017
Quantum discord measures quantum correlation by comparing the quantum mutual information with the maximal amount of mutual information accessible to a quantum measurement. This paper analyzes the properties of diagonal discord, a simplified version of discord that compares quantum mutual information with the mutual information revealed by a measurement
Zi-Wen Liu, Ryuji Takagi, Seth Lloyd
arxiv   +6 more sources

Weak quantum discord [PDF]

open access: yesQuantum Inf Process (2018) 17: 194, 2018
Originally introduced as the difference between two possible forms of quantum mutual information, quantum discord has posteriorly been shown to admit a formulation according to which it measures a distance between the state under scrutiny and the closest projectively measured (non-discordant) state.
P. R. Dieguez, R. M. Angelo
arxiv   +5 more sources

Quantum Discord: A Measure of the Quantumness of Correlations [PDF]

open access: greenPhysical Review Letters, 2001
Two classically identical expressions for the mutual information generally differ when the systems involved are quantum. This difference defines the quantum discord. It can be used as a measure of the quantumness of correlations. Separability of the density matrix describing a pair of systems does not guarantee vanishing of the discord, thus showing ...
H Ollivier, Wojciech H. Zurek
openalex   +4 more sources

Quantum discords of tripartite quantum systems [PDF]

open access: yesQuant. Inf. Process. (2022) 21:147, (17pp), 2022
The quantum discord of bipartite systems is one of the best-known measures of non-classical correlations and an important quantum resource. In the recent work appeared in [Phys. Rev. Lett 2020, 124:110401], the quantum discord has been generalized to multipartite systems.
Jianming Zhou, Xiaoli Hu, Naihuan Jing
arxiv   +3 more sources

Contextuality and Quantum Discord [PDF]

open access: yesPhysics Letters A 449, 128347 (2022), 2022
One of the defining differences between classical and quantum systems is how measurements affect them. Here, we compare the approaches of contextuality and quantum discord in capturing quantum correlations in special classes of two-qubit states, demonstrating that although non-discordant states are non-contextual, discordant states are not always ...
arxiv   +3 more sources

Gaussian quantum discord [PDF]

open access: yesPhys. Rev. Lett. 105, 020503 (2010), 2010
We extend the quantum discord to continuous variable systems and evaluate Gaussian quantum discord C(\rho) for bipartite Gaussian states. In particular, for squeezed thermal states (STS), we explicitly maximize the extractable information over Gaussian measurements: C(\rho) is minimized by a generalized measurement rather than a projective one.
P. Giorda, M. Paris
arxiv   +6 more sources

Experimental Investigation of the Evolution of Gaussian Quantum Discord in an Open System [PDF]

open access: greenPhys. Rev. Lett. 109, 030402 (2012), 2012
Gaussian quantum discord is a measure of quantum correlations in Gaussian systems. Using Gaussian discord we quantify the quantum correlations of a bipartite entangled state and a separable two-mode mixture of coherent states. We experimentally analyze the effect of noise addition and dissipation on Gaussian discord and show that the former noise ...
Lars S. Madsen   +3 more
openalex   +2 more sources

Quantum discord, local operations, and Maxwell’s demons [PDF]

open access: greenPhys. Rev. A 81, 062103 (2010), 2010
Quantum discord was proposed as a measure of the "quantumness" of correlations. There are at least three different discord-like quantities, two of which determine the difference between the efficiencies of a Szilard's engine under different sets of restrictions. The three discord measures vanish simulataneosly. We introduce an easy way to test for zero
Aharon Brodutch, Daniel R. Terno
openalex   +2 more sources

Operational interpretations of quantum discord [PDF]

open access: greenPhysical Review A, 2011
Quantum discord quantifies non-classical correlations going beyond the standard classification of quantum states into entangled and unentangled ones. Although it has received considerable attention, it still lacks any precise interpretation in terms of some protocol in which quantum features are relevant.
Daniel Cavalcanti   +5 more
openalex   +7 more sources

Topology of quantum discord [PDF]

open access: greenJournal of Physics A: Mathematical and Theoretical, 2013
Revised version submitted to Physical Review ...
Nga T. T. Nguyen, Robert Joynt
openalex   +5 more sources

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