A General Fidelity Limit for Quantum Channels

Details A General Fidelity Limit for Quantum Channels A General Fidelity Limit for Quantum Channels

1996-03-08

arxiv.org/abs/quant-ph/9603014v1

Physics

Quantum Physics

14 pages, RevTeX. Submittted to Physical Review A

Scientific paper

10.1103/PhysRevA.54.4707

We derive a general limit on the fidelity of a quantum channel conveying an
ensemble of pure states. Unlike previous results, this limit applies to
arbitrary coding and decoding schemes, including nonunitary decoding. This
establishes the converse of the quantum noiseless coding theorem for all such
schemes.

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