Information, fidelity, and reversibility in single-qubit measurements

Details Information, fidelity, and reversibility in single-qubit measurements Information, fidelity, and reversibility in single-qubit measurements

2011-01-07

arxiv.org/abs/1101.1376v1

Phys.Rev. A83 (2011) 032114

Physics

Quantum Physics

14 pages, 3 figures

Scientific paper

10.1103/PhysRevA.83.032114

We explicitly calculate information, fidelity, and reversibility of an arbitrary single-qubit measurement on a completely unknown state. These quantities are expressed as functions of a single parameter, which is the ratio of the two singular values of the measurement operator corresponding to the obtained outcome. Thus, our results give information tradeoff relations to the fidelity and to the reversibility at the level of a single outcome rather than that of an overall outcome average.

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