Entropic information-disturbance tradeoff

Abstract

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.

4 pages, 1 figure. Revised version

References in corpus (2)

• Clean Positive Operator Valued Measures
• Degradation of a quantum reference frame

Cited by in corpus (2)

• Global information balance in quantum measurements
• Quantum Measurement Reliability versus Reversibility