On Quantum Fidelities and Channel Capacities

Details On Quantum Fidelities and Channel Capacities On Quantum Fidelities and Channel Capacities

1998-09-04

arxiv.org/abs/quant-ph/9809010v1

IEEE Trans.Info.Theor. 46 (2000) 1317-1329

Physics

Quantum Physics

13 pages, uses IEEEtran.cls, rawfonts.sty, somedefs.sty. Submitted to IEEE Transactions on Information Theory

Scientific paper

We show the equivalence of two different notions of quantum channel capacity: that which uses the entanglement fidelity as its criterion of success in transmission, and that which uses the minimum fidelity of pure states in a subspace of the input Hilbert space as its criterion. As a corollary, any source with entropy rate less than the capacity may be transmitted with high entanglement fidelity. We also show that a restricted class of encodings is sufficient to transmit any quantum source which may be transmitted on a given channel. This enables us to simplify a known upper bound for the channel capacity. It also enables us to show that the availability of an auxiliary classical channel from encoder to decoder does not increase the quantum capacity.

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