Artículos de revistas
Nonzero Classical Discord
Registro en:
Nonzero Classical Discord. Amer Physical Soc, v. 115, p. Jul-2015.
0031-9007
WOS:000357864800001
10.1103/PhysRevLett.115.030403
Autor
Gheorghiu
Vlad; de Oliveira
Marcos C.; Sanders
Barry C.
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) 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. 115 3
PIMS Industry Canada NSERC Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Research Center in Optics and Photonics (CePOF) AITF Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)