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Can the channel capacity of a light-wave communication system be increased by the use of photon-number – squeezed light?

1987; American Physical Society; Volume: 58; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.58.2656

1092-0145

Bahaa E. A. Saleh, Malvin C. Teich,

Visual perception and processing mechanisms

The channel capacity C of a light-wave communication system based on photoevent point process observations cannot be increased by use of photon-number--squeezed light. Under a constraint of maximum photon rate ${\ensuremath{\lambda}}_{\mathrm{max}}$, the channel capacity C=${\ensuremath{\lambda}}_{\mathrm{max}/\mathrm{e}}$ is achieved with a Poisson process. On the other hand, the channel capacity of a communication system based on photon counting can be increased by use of photon-number--squeezed light. The improvement vanishes in the limit of very small mean counts.