Physics – Quantum Physics
Scientific paper
2004-12-11
Phys. Rev. A 72, 042330 (2005)
Physics
Quantum Physics
4 pages, 4 figures
Scientific paper
10.1103/PhysRevA.72.042330
The bosonic quantum channels have recently attracted a growing interest, motivated by the hope that they open a tractable approach to the generally hard problem of evaluating quantum channel capacities. These studies, however, have always been restricted to memoryless channels. Here, it is shown that the classical capacity of a bosonic Gaussian channel with memory can be significantly enhanced if entangled symbols are used instead of product symbols. For example, the capacity of a photonic channel with 70%-correlated thermal noise of one third the shot noise is enhanced by about 11% when using 3.8-dB entangled light with a modulation variance equal to the shot noise.
Cerf Nicolas J.
Clavareau Julien
Macchiavello Chiara
Roland Jérémie
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