Electrically pumped ultrabright entangled photons on chip

• URL: http://arxiv.org/abs/2508.14566v1
• Date: Wed, 20 Aug 2025 09:37:26 GMT
• Title: Electrically pumped ultrabright entangled photons on chip
• Authors: Xu-Feng Jiao, Ming-Yang Zheng, Yi-Hang Chen, Bo Cao, Xina Wang, Yang Liu, Cheng-Ao Yang, Xiu-Ping Xie, Chao-Yang Lu, Zhi-Chuan Niu, Qiang Zhang, Jian-Wei Pan,
• Abstract summary: Entangled photon sources are essential for quantum science and technology.<n>We demonstrate a scalable, high-performance, chip-scale EPS.<n>This compact, integrated EPS enables key applications, including high-speed quantum key distribution.
• Score: 8.971032498623233
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entangled photon sources (EPS) are essential for quantum science and technology. Despite advancements in integrated optical platforms like thin-film lithium niobate, a scalable, high-performance, chip-scale EPS has remained elusive. We address this by demonstrating an electrically pumped, post-selection-free polarization-EPS, achieved through hybrid integration of a distributed feedback laser with thin-film lithium niobate chip which integrates periodically poled lithium niobate waveguides, beam splitter, and polarization rotator combiner. By injecting current into the chip, we realize a high-performance EPS with a bandwidth of 73 nm and an entanglement pair generation rate of 4.5*10^10 pairs/s/mW. The polarization entanglement shows Bell-state fidelities above 96% across frequency-correlated modes. This compact, integrated EPS enables key applications, including high-speed quantum key distribution via wavelength division multiplexing, satellite-based quantum communication, and entanglement-based quantum metrology.

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