连续变量Einstein-Podolsky-Rosen纠缠态光场可由工作在阈值以下的非简并光学参量放大器获得,输入耦合镜、输出耦合镜及非线性晶体等光学元件对于偏振方向相互垂直的两束光场的镀膜参数存在差异,具体表现为输出耦合镜的光学镀膜对偏振方向相互垂直的输出光场的透射率不同。结合实验,详细讨论了镀膜参数差异对纠缠度的影响,为进一步提高纠缠态光场的纠缠度提供了参考。

Continuous variable Einstein-Podolsky-Rosen entangled optical fields can be obtained by a non-degenerate optical parametric amplifier (NOPA) operated below the threshold pump power. The optical coating parameters of optical components as input coupler, output coupler and nonlinear crystal for the two orthogonally polarized beams are different manifested as the transmissivity difference of optical coatings of the output coupler for two orthogonally polarized beams. The influence of the coating parameter difference on entanglement degree is discussed in detail based on the experimental research, which provides references for further improving the entanglement degree of entangled state light fields.