The classical capacity of quantum channels with memory

Details The classical capacity of quantum channels with memory The classical capacity of quantum channels with memory

2009-02-17

arxiv.org/abs/0902.2834v2

Phys. Rev. A 79, 032320 (2009)

Physics

Quantum Physics

6 double-column pages. Short note added on quantum memory channels

Scientific paper

10.1103/PhysRevA.79.032320

We investigate the classical capacity of two quantum channels with memory: a periodic channel with depolarizing channel branches, and a convex combination of depolarizing channels. We prove that the capacity is additive in both cases. As a result, the channel capacity is achieved without the use of entangled input states. In the case of a convex combination of depolarizing channels the proof provided can be extended to other quantum channels whose classical capacity has been proved to be additive in the memoryless case.

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