Classical capacity of a qubit depolarizing channel with memory

Details Classical capacity of a qubit depolarizing channel with memory Classical capacity of a qubit depolarizing channel with memory

2009-01-16

arxiv.org/abs/0901.2516v1

Phys. Rev. A 79, 042303 (2009)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.79.042303

The classical product state capacity of a noisy quantum channel with memory is investigated. A forgetful noise-memory channel is constructed by Markov switching between two depolarizing channels which introduces non-Markovian noise correlations between successive channel uses. The computation of the capacity is reduced to an entropy computation for a function of a Markov process. A reformulation in terms of algebraic measures then enables its calculation. The effects of the hidden-Markovian memory on the capacity are explored. An increase in noise-correlations is found to increase the capacity.

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