Artículos de revistas
Nonzero Classical Discord.
Registro en:
Physical Review Letters. v. 115, n. 3, p. 030403, 2015-Jul.
1079-7114
10.1103/PhysRevLett.115.030403
26230772
Autor
Gheorghiu, Vlad
de Oliveira, Marcos C
Sanders, Barry C
Institución
Resumen
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 030403