基于微环谐振腔的宽带纠缠源制备方案

Preparation of broadband entangled source based on microring resonator

近年来,量子纠缠在量子通信、量子计算等方面得到广泛的应用,因此制备高性能多样化的集成量子多组份纠缠源具有重要的研究意义。利用可调谐激光器泵浦氮化硅微环谐振腔,在三阶非线性效应的作用下谐振腔内会发生四波混频现象,产生信号光和闲置光。基于信号光和闲置光之间是否存在纠缠的纠缠判据,计算出各组份信号光与闲置光之间的纠缠度。结果显示微环谐振腔可以产生八对双组份连续变量量子纠缠态。该纠缠源系统具有体积小、功耗低、易于集成的优势,在集成光量子芯片领域中具有较重要的研究价值。

In recent years, quantum entanglement has been widely used in quantum communication,quantum computation and so on. Therefore, it is of great significance to prepare high-performance and integrated quantum multicomponent entanglement sources. The silicon nitride microring resonator is pumped by a tunable laser in this work, and four wave mixing occurs in the resonator under the action of third-order nonlinear effect, resulting in the generation of signal light and idle light. Then based on the entanglement criterion for judging the entanglement between signal and idle light, the degree of entanglement between signal and idle light is calculated. The results show that eight pairs of two-component continuous variable quantum entangled states can be generated in the microring resonator. Besides, the entanglement source system has several advantages such as small size, low power consumption and simplified integration, which has important research value in the field of integrated optical quantum chips.