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Fidelity and the communication of quantum information

Barnett, Stephen M. and Gilson, Claire R. and Sasaki, Masahide (2001) Fidelity and the communication of quantum information. Journal of Physics A: Mathematical and Theoretical, 34 (35). pp. 6755-6766. ISSN 0305-4470

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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 maximizing the fidelity given a source that encodes information on the symmetric qubit-states.