Entanglement-Assisted Capacity of Quantum Multiple-Access Channels

Details Entanglement-Assisted Capacity of Quantum Multiple-Access Channels Entanglement-Assisted Capacity of Quantum Multiple-Access Channels

2005-11-24

arxiv.org/abs/quant-ph/0511228v2

IEEE Transaction on Information Theory, vol. 54, Issue 7, pp. 3078-3090, Jul. 2008

Physics

Quantum Physics

Published version. 13 pages, 3 figures

Scientific paper

10.1109/TIT.2008.924726

We find a regularized formula for the entanglement-assisted (EA) capacity region for quantum multiple access channels (QMAC). We illustrate the capacity region calculation with the example of the collective phase-flip channel which admits a single-letter characterization. On the way, we provide a first-principles proof of the EA coding theorem based on a packing argument. We observe that the Holevo-Schumacher-Westmoreland theorem may be obtained from a modification of our EA protocol. We remark on the existence of a family hierarchy of protocols for multiparty scenarios with a single receiver, in analogy to the two-party case. In this way, we relate several previous results regarding QMACs.

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