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arXiv:quant-ph/9712020 · Optics Communications

Optimal signal-to-quantum noise ratio for nonclassical number states

Yinqi Feng, A. I. Solomon

Published Jul 1, 1998• 9 citations
arXivHTMLPDF
DOI
10.1016/s0030-4018(98)00202-8

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For an arbitary quantum state of radiation with frequency the optimum signal-to-quantum noise ratio for fixed energy (or power per unit frequency) h ω N 3 has the value 4 N 3 ( N 3 +1), attainable by the squeezed coherent vacuum. The question arises as to what ρ is attainable when the vacuum is imperfect, and there are n photons present. We show that in such a situation the attainable signal-to-quantum noise ratio ρ is reduced by a factor (2 n +1) 2 . These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.