Semiconductor quantum dots in photonic integrated circuits enable scaling quantum‐information processing to many single photons and quantum‐optical gates. Obtaining high‐purity and coherent single photons from quantum dots requires spectral filtering to select individual excitonic transitions. Here, an on‐chip wavelength‐tunable filter integrated with a single‐photon source, which preserves the optical properties of the emitter, is demonstrated. Nanomechanical motion is used for tuning the resonant wavelength over 10 nm, enabling operation at cryogenic temperatures, and single‐photon emission from a quantum dot under non‐resonant excitation is demonstrated without resorting to free‐space optical filters. These results are key for the development of fully integrated de‐multiplexing, multi‐path photon encoding schemes, and multi‐emitter circuits.

中文翻译：

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量子点单光子源的片上纳米机械滤波

光子集成电路中的半导体量子点可将量子信息处理扩展到许多单光子和量子光学门。要从量子点获得高纯度且相干的单光子，需要进行光谱滤波以选择各个激子跃迁。在这里，展示了一个集成了单光子源的片上波长可调滤波器，该滤波器保留了发射器的光学特性。纳米机械运动用于调节10 nm以上的共振波长，使其能够在低温下工作，并且在不借助自由空间滤光片的情况下，演示了在非共振激发下量子点的单光子发射。这些结果对于开发完全集成的解复用，多路径光子编码方案和多发射器电路至关重要。