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Phys Rev Lett. 2004 Jan 16;92(2):027902. Epub 2004 Jan 15.

Classical capacity of the lossy bosonic channel: the exact solution.

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1
Massachusetts Institute of Technology-Research Laboratory of Electronics, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA.

Abstract

The classical capacity of the lossy bosonic channel is calculated exactly. It is shown that its Holevo information is not superadditive, and that a coherent-state encoding achieves capacity. The capacity of far-field, free-space optical communications is given as an example.

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