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Having the quantum correlations in a general bipartite state in mind, theinformation accessible by simultaneous measurement on both subsystems is shownnever to exceed the information accessible by measurement on one subsystem,which, in turn is proved not to exceed the von Neumann mutual information. Aparticular pair of (opposite- subsystem) observables are shown to beresponsible both for the amount of quasi-classical correlations and for that ofthe purely quantum entanglement in the pure-state case: the former viasimultaneous subsystem measurements, and the latter through the entropy ofcoherence or of incompatibility, which is defined for the general case. Theobservables at issue are so-called twin observables. A general definition ofthe latter is given in terms of their detailed properties.Comment: 7 pages, Latex2e, selected for the December 2002 issue of the Virtual  Journal of Quantum Informatio

Chains of quasiclassical information for bipartite correlations and the role of twin observables