Global information balance in quantum measurements
Quantum Physics
2008-06-10 v5
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.
Cite
@article{arxiv.quant-ph/0702166,
title = {Global information balance in quantum measurements},
author = {Francesco Buscemi and Masahito Hayashi and Michal Horodecki},
journal= {arXiv preprint arXiv:quant-ph/0702166},
year = {2008}
}
Comments
Final version to appear on Physical Review Letters