Entanglement-enhanced classical capacity of two-qubit quantum channels with memory: the exact solution

Details Entanglement-enhanced classical capacity of two-qubit quantum channels with memory: the exact solution Entanglement-enhanced classical capacity of two-qubit quantum channels with memory: the exact solution

2006-10-19

arxiv.org/abs/quant-ph/0610165v1

Phys. Rev. A 76, 012310 (2007)

Physics

Quantum Physics

5 pages

Scientific paper

10.1103/PhysRevA.76.012310

The maximal amount of information which is reliably transmitted over two uses of general Pauli channels with memory is proven to be achieved by maximally entangled states beyond some memory threshold. In particular, this proves a conjecture on the depolarizing channel by Macchiavello and Palma [Phys. Rev. A {\bf 65}, 050301(R) (2002)]. Below the memory threshold, for arbitrary Pauli channels, the two-use classical capacity is only achieved by a particular type of product states.

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