Quantum light sources with configurable lifetime leveraging parity-time symmetry

作者：Nuo Chen, Wenxiu Li, Yunru Fan, Hanghang Li, Hong Zeng, Wu-Qiang Chi, Heng Zhou, Hao Li, Lixing You, Guang-Can Guo, Qiang Zhou, Jing Xu, Xinliang Zhang · 发表于：Nature Communications · 年份：2025 · DOI：10.1038/s41467-025-65698-9 · 被引用次数：2 · 研究领域：Quantum Mechanics and Non-Hermitian Physics、Mechanical and Optical Resonators、Topological Materials and Phenomena

Quantum light sources with configurable photon lifetimes are essential for large-scale quantum circuits, enabling applications in programmable quantum computing, quantum communications, and quantum metrology. However, the fundamental trade-off between efficiency and photon lifetime imposes significant challenges on the design of high-performance, large configurable lifetime quantum light sources. Here, we report on such chip-scale quantum light sources by harnessing the unique feature of parity-time (PT) symmetry. The core design centers on employing PT-symmetric coupling between two microresonators of distinct circumferences, enabling a broad range and selective tuning of the intracavity photon density of states. By controlling the alignment between resonators, we achieved a near 20-fold photon lifetime tuning range (7.1 ± 1.5 ~ 129.6 ± 1.9 ps), with the shortest lifetimes near the exceptional point (EP). The device generates energy-time entangled photon pairs with 87.1 ± 1.1% interference visibility and a heralded second-order autocorrelation of $${g}_{H}^{\left(2\right)}\left(0\right)=$$ 0.069 ± 0.001. Our work highlights the potential of PT symmetry for advanced quantum applications, including high-speed communication and programmable quantum computing, quantum coherent tomography, and beyond. Quantum light sources are promising for quantum circuits, yet facing an inherent trade-off between multifunction and brightness. By leveraging a strategy based on parity-time symmet...