Entropic information-disturbance tradeoff

Details Entropic information-disturbance tradeoff Entropic information-disturbance tradeoff

2006-04-06

arxiv.org/abs/quant-ph/0604038v3

Europhys. Lett. 77, 40002 (2007)

Physics

Quantum Physics

4 pages, 1 figure. Revised version

Scientific paper

10.1209/0295-5075/77/40002

We show the flaws found in the customary fidelity-based definitions of disturbance in quantum measurements and evolutions. We introduce the "entropic disturbance" D and show that it adequately measures the degree of disturbance, intended essentially as an irreversible change in the state of the system. We also find that it complies with an information-disturbance tradeoff, namely the mutual information between the eigenvalues of the initial state and the measurement results is less than or equal to D.

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