Ma Chenxi, Yang Jingzhong, Li Pengji, Rugeramigabo Eddy P, Zopf Michael, Ding Fei
Opt Express. 2024 Apr 8;32(8):14789-14800. doi: 10.1364/OE.517758.
Efficient generation of entangled photon pairs at telecom wavelengths is a key ingredient for long-range quantum networks. While embedding semiconductor quantum dots into hybrid circular Bragg gratings has proven effective, it conflicts with p-i-n diode heterostructures which offer superior coherence. We propose and analyze hybrid circular photonic crystal gratings, incorporating air holes to facilitate charge carrier transport without compromising optical properties. Through numerical simulations, a broad cavity mode with a Purcell factor of 23 enhancing both exciton and biexciton transitions, and exceptional collection efficiency of 92.4% into an objective with numerical aperture of 0.7 are achieved. Furthermore, our design demonstrates direct coupling efficiency over 90.5% into a single-mode fiber over the entire telecom C-band. The hybrid circular photonic crystal grating thereby emerges as a promising solution for the efficient generation of highly coherent, polarization-entangled photon pairs.
在电信波长下高效产生纠缠光子对是远程量子网络的关键要素。虽然将半导体量子点嵌入混合圆形布拉格光栅已被证明是有效的，但它与具有卓越相干性的p-i-n二极管异质结构相冲突。我们提出并分析了混合圆形光子晶体光栅，其包含气孔以促进电荷载流子传输而不损害光学特性。通过数值模拟，实现了具有23的珀塞尔因子的宽腔模，增强了激子和双激子跃迁，以及在数值孔径为0.7的物镜中92.4%的卓越收集效率。此外，我们的设计在整个电信C波段展示了超过90.5%的直接耦合效率进入单模光纤。混合圆形光子晶体光栅因此成为高效产生高相干、偏振纠缠光子对的有前景的解决方案。
