Integrated photonic circuits have become an attractive platform for the quantum information processing, paving the way for quantum information management with scalable device. In this context, silicon photonics represents the most mature technology to implement the quantum system functionalities, due to its large scalability and compatibility with CMOS technology. Efficient photon-pairs sources based on Spontaneous Four-Wave Mixing (SFWM) and high-performance photodetector have been already demonstrated. The efficient detection of photon-pairs requires a pump filter at the photodetector, preserving the signal-idler pair. Thus, filters with high Extinction Ratio (ER), low Insertion Loss (IL) and narrow rejection Bandwidth (BW) are needed. Here, we propose the design of an ultra-high-performance rejection filter, based on a silicon dual-loaded single input/output Mach-Zehnder Interferometer (MZI), with one branch coupled to a Ring Resonator (RR) and the other to three serially coupled RRs forming a Coupled Optical Resonator Waveguide (CROW). Very high performance (ER = 150.55 dB, IL = 0.104 dB, BW = 0.243 nm), within a footprint of 60 µm × 160 µm, has been calculated, demonstrating its suitability for an efficient suppression of the pump signal. The filter response is also thermo-optically tuneable in a 6 MHz range, with a reconfigurability time of about 8 µs.

集成光子电路已成为用于量子信息处理的有吸引力的平台，从而为使用可扩展设备进行量子信息管理铺平了道路。在这种情况下，硅光子技术由于具有较大的可扩展性和与CMOS技术的兼容性，因此是实现量子系统功能的最成熟技术。已经证明了基于自发四波混频（SFWM）和高性能光电探测器的高效光子对源。要有效地检测光子对，需要在光检测器处安装一个泵滤器，以保留信号-空闲对。因此，具有高消光比（ER），低插入损耗（IL）和窄抑制带宽（BW）。在这里，我们提出了一种超高性能抑制滤波器的设计，该滤波器基于硅双负载单输入/输出马赫曾德尔干涉仪（MZI），其中一个分支耦合到环形谐振器（RR），另一个分支耦合到环形谐振器（RR）。三个串联耦合的RR，形成耦合的光学谐振器波导（CROW）。 在60 µm×160 µm的占位面积内，已计算出非常高的性能（ER  = 150.55 dB，IL  = 0.104 dB，BW = 0.243 nm），表明其适用于有效抑制泵浦信号。滤波器响应也可在6 MHz范围内进行热光调谐，可重新配置时间约为8 µs。