Global information balance in quantum measurements
arXiv:quant-ph/0702166 · doi:10.1103/PhysRevLett.100.210504
Abstract
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.
Final version to appear on Physical Review Letters