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Fidelity and the communication of quantum information

Stephen M. Barnett, Claire R. Gilson, Masahide Sasaki

quant-pharXiv:quant-ph/0107024

Abstract

We compare and contrast the error probability and fidelity as measures of the quality of the receiver's measurement strategy for a quantum communications system. The error probability is a measure of the ability to retrieve classical information and the fidelity measures the retrieval of quantum information. We present the optimal measurement strategies for maximising the fidelity given a source that encodes information on the symmetric qubit-states.

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