Christensen J B, Koefoed J G, Rottwitt K, McKinstrie C J
Opt Lett. 2018 Feb 15;43(4):859-862. doi: 10.1364/OL.43.000859.
The future of integrated quantum photonics relies heavily on the ability to engineer refined methods for preparing the quantum states needed to implement various quantum protocols. An important example of such states is quantum-correlated photon pairs, which can be efficiently generated using spontaneous nonlinear processes in integrated microring-resonator structures. In this work, we propose a method for generating spectrally unentangled photon pairs from a standard microring resonator. The method utilizes interference between a primary and a delayed secondary pump pulse to effectively increase the pump spectral width inside the cavity. This enables on-chip generation of heralded single photons with state purities in excess of 99% without spectral filtering.
集成量子光子学的未来在很大程度上依赖于设计出精细方法的能力，这些方法用于制备实施各种量子协议所需的量子态。此类量子态的一个重要例子是量子关联光子对，它可以利用集成微环谐振器结构中的自发非线性过程高效产生。在这项工作中，我们提出了一种从标准微环谐振器产生光谱非纠缠光子对的方法。该方法利用初级泵浦脉冲和延迟的次级泵浦脉冲之间的干涉，有效地增加腔内泵浦光谱宽度。这使得能够在芯片上产生态纯度超过99%的有 heralded 单光子，而无需光谱滤波。
