On the transitional behavior of quantum Gaussian memory channels

Details On the transitional behavior of quantum Gaussian memory channels On the transitional behavior of quantum Gaussian memory channels

2010-03-11

arxiv.org/abs/1003.2393v2

Phys. Rev. A 81, 052314 (2010)

Physics

Quantum Physics

Typos corrected, close to the published version. 9 pages, comments are welcome

Scientific paper

10.1103/PhysRevA.81.052314

We address the question of optimality of entangled input states in quantum
Gaussian memory channels. For a class of such channels, that can be traced back
to the memoryless setting, we state a criterion which relate the optimality of
entangled inputs to the symmetry properties of the channels' action. Several
examples of channel models belonging to this class are discussed.

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