Lam P, Ralph T, Huntington E, McClelland D, Bachor H
Opt Express. 1998 Feb 2;2(3):100-9. doi: 10.1364/oe.2.000100.
We demonstrate an elegant way of handling optical signals which are generated using squeezed states of light without losing their improved signal to noise ratio. We do this by amplifing, without significant noise penalty, both signal and noise away from the quantum noise limit into the classical domain. This makes the information robust to losses. Our system achieves a signal transfer coefficient, T(s), close to unity. As a demonstration we amplify a small signal carried by 35% amplitude squeezed light and show that unlike the fragile squeezed input, the signal amplified output is robust to propagation losses. A signal transfer coefficient of T(s) = 0.75 is achieved even in the presence of large introduced (86%) downstream losses.
我们展示了一种处理光信号的巧妙方法，该光信号是利用光的压缩态产生的，且不会损失其改善后的信噪比。我们通过在不产生显著噪声代价的情况下，将信号和噪声从量子噪声极限放大到经典域来实现这一点。这使得信息对损耗具有鲁棒性。我们的系统实现了接近单位的信号传输系数T(s)。作为演示，我们放大了由35%幅度压缩光携带的小信号，并表明与脆弱的压缩输入不同，放大后的信号输出对传播损耗具有鲁棒性。即使存在较大的引入（86%）下游损耗，仍实现了T(s)=0.75的信号传输系数。
