Capacities of lossy bosonic memory channels

Details Capacities of lossy bosonic memory channels Capacities of lossy bosonic memory channels

2009-03-16

arxiv.org/abs/0903.2764v1

Phys. Rev. Lett. 104, 030501 (2010)

Physics

Quantum Physics

4 pages, 2 fugures. Comments are welcome

Scientific paper

10.1103/PhysRevLett.104.030501

We introduce a general model for a lossy bosonic memory channel and calculate the classical and the quantum capacity, proving that coherent state encoding is optimal. The use of a proper set of collective field variables allows to unravel the memory, showing that the n-fold concatenation of the memory channel is unitarily equivalent to the direct product of n single-mode lossy bosonic channels.

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