| Entanglement-Assisted Capacity of Quantum Multiple Access Channels (2005) | |||||||||
Abstract | |||||||||
| 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.. Comment: 22 pages, 2 figures | |||||||||
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