Entanglement-assisted capacity of constrained quantum channel

Details Entanglement-assisted capacity of constrained quantum channel Entanglement-assisted capacity of constrained quantum channel

2002-11-26

arxiv.org/abs/quant-ph/0211170v2

Physics

Quantum Physics

Extended version of paper presented at Quantum Informatics Symposium, Zvenigorod, 1-4.10.2002

Scientific paper

10.1117/12.517873

In this paper we fill the gap in previous works by proving the formula for entanglement-assisted capacity of quantum channel with additive constraint (such as bosonic Gaussian channel). The main tools are the coding theorem for classical-quantum constrained channels and a finite dimensional approximation of the input density operators for entanglement-assisted capacity. The new version contains improved formulation of sufficient conditions under which suprema in the capacity formulas are attained.

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