Physics – Quantum Physics
Scientific paper
2003-05-30
Phys. Rev. A 66 (2002) 052321-1-6
Physics
Quantum Physics
7 pages, Latex2e, selected for the December 2002 issue of the Virtual Journal of Quantum Information
Scientific paper
10.1103/PhysRevA.66.052321
Having the quantum correlations in a general bipartite state in mind, the information accessible by simultaneous measurement on both subsystems is shown never to exceed the information accessible by measurement on one subsystem, which, in turn is proved not to exceed the von Neumann mutual information. A particular pair of (opposite- subsystem) observables are shown to be responsible both for the amount of quasi-classical correlations and for that of the purely quantum entanglement in the pure-state case: the former via simultaneous subsystem measurements, and the latter through the entropy of coherence or of incompatibility, which is defined for the general case. The observables at issue are so-called twin observables. A general definition of the latter is given in terms of their detailed properties.
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