Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/241796
Type: Artigo
Title: Nonzero classical discord
Author: Gheorghiu, V.
Oliveira, M. C. de
Sanders, B. C.
Abstract: Quantum discord is the quantitative difference between two alternative expressions for bipartite mutual information, given respectively in terms of two distinct definitions for the conditional entropy. By constructing a stochastic model of shared states, classical discord can be similarly defined, quantifying the presence of some stochasticity in the measurement process. Therefore, discord can generally be understood as a quantification of the system's state disturbance due to local measurements, be it quantum or classical. We establish an operational meaning of classical discord in the context of state merging with noisy measurement and thereby show the quantum-classical separation in terms of a negative conditional entropy.
Quantum discord is the quantitative difference between two alternative expressions for bipartite mutual information, given respectively in terms of two distinct definitions for the conditional entropy. By constructing a stochastic model of shared states, classical discord can be similarly defined, quantifying the presence of some stochasticity in the measurement process. Therefore, discord can generally be understood as a quantification of the system's state disturbance due to local measurements, be it quantum or classical. We establish an operational meaning of classical discord in the context of state merging with noisy measurement and thereby show the quantum-classical separation in terms of a negative conditional entropy.
Subject: Teoria quântica
Country: Estados Unidos
Editor: American Physical Society
Citation: Nonzero Classical Discord. Amer Physical Soc, v. 115, p. Jul-2015.
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.115.030403
Address: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.030403
Date Issue: 2015
Appears in Collections:IFGW - Artigos e Outros Documentos

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