Optimal signal-to-quantum noise ratio in squeezed displaced number states

被引：0
|
作者：
Feng, YQ [1 ]
Solomon, AI [1 ]
机构：
[1] Open Univ, Fac Math & Comp, Milton Keynes MK7 6AA, Bucks, England
来源：
QUANTUM COMMUNICATION, COMPUTING, AND MEASUREMENT 2 | 2000年
关键词：
D O I：
暂无
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
For an arbitary quantum state of radiation with frequency omega, the optimum signal-to-quantum noise ratio rho for fixed energy (or power per unit frequency) (h) over bar omegaN(s) has the value 4N(s)(N-s + 1), attainable by the squeezed coherent vacuum. The question arises as to what rho 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 rho is reduced by a factor (2n + 1)(2).
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页码：111 / 114
页数：4
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