Global information balance in quantum measurements

Details Global information balance in quantum measurements Global information balance in quantum measurements

2007-02-16

arxiv.org/abs/quant-ph/0702166v5

Phys. Rev. Lett. 100, 210504 (2008)

Physics

Quantum Physics

Final version to appear on Physical Review Letters

Scientific paper

10.1103/PhysRevLett.100.210504

We perform an information-theoretical analysis of quantum measurement processes and obtain the global information balance in quantum measurements, in the form of a closed chain equation for quantum mutual entropies. Our balance provides a tight and general entropic information-disturbance trade-off, and explains the physical mechanism underlying it. Finally, the single-outcome case, that is, the case of measurements with post-selection, is briefly discussed.

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