Multiplicativity of Accessible Fidelity and Quantumness for Sets of Quantum States

Details Multiplicativity of Accessible Fidelity and Quantumness for Sets of Quantum States Multiplicativity of Accessible Fidelity and Quantumness for Sets of Quantum States

2003-08-22

arxiv.org/abs/quant-ph/0308120v1

Quantum Inf. Comput. 4(1):1--11, 2004.

Physics

Quantum Physics

Scientific paper

Two measures of sensitivity to eavesdropping for alphabets of quantum states were recently introduced by Fuchs and Sasaki in quant-ph/0302092. These are the accessible fidelity and quantumness. In this paper we prove an important property of both measures: They are multiplicative under tensor products. The proof in the case of accessible fidelity shows a connection between the measure and characteristics of entanglement-breaking quantum channels.

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