Related papers: Quantum light sources with configurable lifetime leveraging parity-time symmetry

Quantum light sources with configurable lifetime leveraging parity-time symmetry

URL: http://arxiv.org/abs/2504.01413v1
Date: Wed, 02 Apr 2025 07:04:31 GMT
Title: Quantum light sources with configurable lifetime leveraging parity-time symmetry
Authors: Nuo Chen, Wen-Xiu Li, Yun-Ru Fan, Hang-Hang Li, Hong Zeng, Wu-Qiang Chi, Heng Zhou, Hao Li, Li-Xing You, Guang-Can Guo, Qiang Zhou, Jing Xu, Xin-Liang Zhang,
Abstract summary: Device generates energy-time entangled photon pairs with 87.1 +- 1.1% interference visibility and a heralded second-order autocorrelation of g_h((2) ) (0)= 0.069 +- 0.001.<n>Our work highlights the potential of PT symmetry for advanced quantum applications, including high-speed communication and programmable quantum computing.
Score: 26.056219942960112
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Quantum light sources with configurable photon lifetimes are essential for large-scale quantum circuits, enabling applications in programmable quantum computing, various quantum key distribution protocols, and quantum tomography techniques. 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 broad-range and selective tuning of intracavity photon density of states. By controlling the alignment between resonators, we achieved a 38-fold photon lifetime tuning range (4 ~ 158 ps), with the shortest lifetimes near the exceptional points of the PT-symmetric systems. The device generates energy-time entangled photon pairs with 87.1 +- 1.1% interference visibility and a heralded second-order autocorrelation of g_h^((2) ) (0)= 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.

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