论文标题
通过延迟泵式型间的四波混合来缓解光子对源中的不可区分性问题
Mitigating indistinguishability issues in photon pair sources by delayed-pump Intermodal Four Wave Mixing
论文作者
论文摘要
在当今的噪声中间量表量子设备（NISQ）中，大量独立，纯净和相同的预言单光子源无处不在。在发展越来越理想来源的竞赛中，多模型波导中的延迟泵式多模式的四波混合（IFWM）最近在所有这些指标中都表现出了创纪录的性能，成为集成光学中自发源的基准。尽管如此，制造缺陷仍然破坏了独立来源的光子对的光谱不可区分。在这里，我们表明，通过缩小波导的宽度并控制泵脉冲之间的延迟，我们在源中添加了光谱可调性，同时仍在继承IFWM方案的所有记录指标。此功能用于在存在误差的情况下恢复光谱的不可辨式性。在波导维度上的现实公差下，我们预测在同一芯片上独立来源之间的不可分性> 99.5％，而预示的Hong Ou Mandel可见性<0.35％。
Large arrays of independent, pure and identical heralded single photon sources are ubiquitous in today's Noise Intermediate Scale Quantum devices (NISQ). In the race towards the development of increasingly ideal sources, delayed-pump Intermodal Four Wave Mixing (IFWM) in multimode waveguides has recently demonstrated record performances in all these metrics, becoming a benchmark for spontaneous sources in integrated optics. Despite this, fabrication imperfections still spoil the spectral indistinguishability of photon pairs from independent sources. Here we show that by tapering the width of the waveguide and by controlling the delay between the pump pulses, we add spectral tunability to the source while still inheriting all the record metrics of the IFWM scheme. This feature is used to recover spectral indistinuishability in presence of fabrication errors. Under realistic tolerances on the waveguide dimensions, we predict >99.5% indistinguishability between independent sources on the same chip, and a maximum degradation of the Heralded Hong Ou Mandel visibility <0.35 %.
