Interferometers are essential elements in classical and quantum optical systems. The strictly required stability when extracting the phase of photons is vulnerable to polarization variation and phase shift induced by environment disturbance. Here, we implement polarization-insensitive interferometers by combining silica planar light-wave circuit chips and Faraday rotator mirrors. Two asymmetric interferometers with temperature controllers are connected in series to evaluate the single-photon interference. Average interference visibility over 12 h is above 99%, and the variations are less than 0.5%, even with active random polarization disturbance. The experiment results verify that the hybrid chip is available for high-demand applications like quantum key distribution and entanglement measurement.

中文翻译：

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基于混合集成平面光波电路的偏振不敏感干涉仪

干涉仪是经典和量子光学系统中必不可少的元件。提取光子相位时严格要求的稳定性容易受到环境干扰引起的极化变化和相移的影响。在这里，我们通过结合二氧化硅平面光波电路芯片和法拉第旋转镜来实现偏振不敏感干涉仪。两个带温度控制器的非对称干涉仪串联以评估单光子干涉。12 小时内的平均干扰能见度在 99% 以上，变化小于 0.5%，即使有主动随机极化干扰。实验结果验证了该混合芯片可用于量子密钥分发和纠缠测量等高需求应用。