A note on quantum entropy inequalities and channel capacities

Details A note on quantum entropy inequalities and channel capacities A note on quantum entropy inequalities and channel capacities

2002-11-21

arxiv.org/abs/quant-ph/0211136v3

J.Phys.A 36, 12081 (2003).

Physics

Quantum Physics

Revtex, 7 pages, the relation between entanglement-assisted and one-shot unassisted capacities is added

Scientific paper

10.1088/0305-4470/36/48/010

Quantum entropy inequalities are studied. Some quantum entropy inequalities are obtained by several methods. For entanglement breaking channel, we show that the entanglement-assisted classical capacity is upper bounded by $\log d$. A relationship between entanglement-assisted and one-shot unassisted capacities is obtained. This relationship shows the entanglement-assisted channel capacity is upper bounded by the sum of $\log d$ and the one-shot unassisted classical capacity.

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