Distinguishability, classical information of quantum operations

Details Distinguishability, classical information of quantum operations Distinguishability, classical information of quantum operations

2005-04-09

arxiv.org/abs/quant-ph/0504073v1

Physics

Quantum Physics

11 pages, 0 figures

Scientific paper

A basic property of distinguishability is that it is non-increasing under further quantum operations. Following this, we generalize two measures of distinguishability of pure states--fidelity and von Neumann entropy, to mixed states as self-consistent measures. Then we extend these two measures to quantum operations. The information-theoretic point of the generalized Holevo quantity of an ensemble of quantum operations is constructed. Preferably it is an additive measure. The exact formula for SU(2) ensemble is presented. With the aid of the formula, we show Jozsa-Schlienz paradox that states as a whole are less distinguishable while all pairwise are more distinguishable in an ensemble of quantum states, also occurs in an ensemble of quantum operations, even in the minimal dimensional case SU(2) ensemble.

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