Crystalline whispering gallery mode resonators (WGMRs) have been shown to facilitate versatile sources of quantum states that can efficiently interact with atomic systems. These features make WGMRs an efficient platform for quantum information processing. Here, we experimentally show that it is possible to generate polarization entanglement from WGMRs by using an interferometric scheme. Our scheme gives us the flexibility to control the phase of the generated entangled state by changing the relative phase of the interferometer. The S value of Clauser–Horne–Shimony–Holt’s inequality in the system is 2.45 ± 0.07, which violates the inequality by more than six standard deviations.

晶体回音壁模式谐振器（WGMR）已被证明可以促进多种量子态源的使用，从而可以有效地与原子系统相互作用。这些功能使 WGMR 成为量子信息处理的高效平台。在这里，我们通过实验证明，可以通过使用干涉方案从 WGMR 产生偏振纠缠。我们的方案使我们能够通过改变干涉仪的相对相位来灵活地控制生成的纠缠态的相位。系统中 Clauser–Horne–Shimony–Holt 不等式的S值为 2.45 ± 0.07，违反不等式超过 6 个标准差。