Wang Yu-Tong, Ye Qi-Hang, Yan Jun-Yong, Qiao Yufei, Liu Yu-Xin, Ye Yong-Zheng, Chen Chen, Cheng Xiao-Tian, Li Chen-Hui, Zhang Zi-Jian, Huang Cheng-Nian, Meng Yun, Zou Kai, Zhan Wen-Kang, Zhao Chao, Hu Xiaolong, Tee Clarence Augustine T H, Sha Wei E I, Huang Zhixiang, Liu Huiyun, Jin Chao-Yuan, Ying Lei, Liu Feng
State Key Laboratory of Extreme Photonics and Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
School of Physics, Zhejiang Key Laboratory of Micro-nano Quantum Chips and Quantum Control, Zhejiang University, Hangzhou 310027, China.
Sci Adv. 2025 May 23;11(21):eadv8115. doi: 10.1126/sciadv.adv8115. Epub 2025 May 21.
Quantum emitters are a key component in photonic quantum technologies. Enhancing single-photon emission by engineering their photonic environment is essential for improving overall efficiency in quantum information processing. However, this enhancement is often limited by the need for ultraprecise emitter placement within conventional photonic cavities. Inspired by the fascinating physics of moiré pattern, we propose a multilayer moiré photonic crystal with a robust isolated flatband. Theoretical analysis reveals that, with nearly infinite photonic density of states, the moiré cavity simultaneously has a high Purcell factor and large tolerance over the emitter's position, breaking the constraints of conventional cavities. We then experimentally demonstrate various cavity quantum electrodynamic phenomena with a quantum dot in moiré cavity. A large tuning range (up to 40-fold) of quantum dot's radiative lifetime is achieved through strong Purcell enhancement and inhibition effects. Our findings open the door for moiré flatband cavity-enhanced quantum light sources and quantum nodes for the quantum internet.
量子发射器是光子量子技术的关键组件。通过设计其光子环境来增强单光子发射对于提高量子信息处理的整体效率至关重要。然而，这种增强通常受到在传统光子腔中对超精确发射器放置的需求的限制。受莫尔条纹迷人物理特性的启发，我们提出了一种具有稳健孤立平带的多层莫尔光子晶体。理论分析表明，由于具有近乎无限的光子态密度，莫尔腔同时具有高珀塞尔因子和对发射器位置的大容差，打破了传统腔的限制。然后，我们通过在莫尔腔中的量子点实验演示了各种腔量子电动力学现象。通过强珀塞尔增强和抑制效应，实现了量子点辐射寿命的大调节范围（高达40倍）。我们的发现为莫尔平带腔增强的量子光源和量子互联网的量子节点打开了大门。
