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Global information balance in quantum measurements

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arxiv quant-ph/0702166 v5 pith:QO4ZXFNE submitted 2007-02-16 quant-ph

Global information balance in quantum measurements

classification quant-ph
keywords quantumbalancemeasurementscaseglobalinformationanalysisbriefly
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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