Global information balance in quantum measurements.

  title={Global information balance in quantum measurements.},
  author={Francesco Buscemi and Masahito Hayashi and Michał Horodecki},
  journal={Physical review letters},
  volume={100 21},
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 posts election, is briefly discussed. 

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