Opt Lett. 2019 Apr 1;44(7):1789-1792. doi: 10.1364/OL.44.001789.
We demonstrate the dependence of the squeezing and anti-squeezing factors on the seed beam power at different pump beam noise levels. The results indicate that a seed field injected into the optical parametric amplifier (OPA) dramatically degenerates the squeezing factor due to noise coupling between the pump and seed fields, even if both the pump and seed fields reach the shot noise limit. The squeezing and anti-squeezing factors are immune to the pump beam noise due to no noise coupling when the system operates for the generation of squeezed vacuum states. The squeezing factor degrades gradually as the pump beam intensity noise and seed beam power is increased. The influence of the two orthogonal quadrature variations is mutually independent of each other.
我们演示了在不同抽运光束噪声水平下，压缩和反压缩因子对种子光束功率的依赖关系。结果表明，即使抽运和种子光束都达到散粒噪声极限，注入光学参量放大器（OPA）的种子场由于抽运和种子场之间的噪声耦合，会显著降低压缩因子。当系统运行以产生压缩真空态时，由于没有噪声耦合，压缩和反压缩因子对抽运光束噪声免疫。随着抽运光束强度噪声和种子光束功率的增加，压缩因子逐渐降低。两个正交正交分量的变化的影响是相互独立的。
