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arXiv · 2502.19740

Optimized quantum entanglement network enabled by a state-multiplexing quantum light source

Yun-Ru Fan·Yue Luo·Kai Guo·Jin-Peng Wu·Hong Zeng·Guang-Wei Deng·You Wang·Hai-Zhi Song·Zhen Wang·Li-Xing You·Guang-Can Guo·Qiang Zhou
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Abstract

A fully connected quantum network with a wavelength division multiplexing architecture plays an increasingly pivotal role in quantum information technology. With such architecture, an entanglement-based network has been demonstrated in which an entangled photon-pair source distributes quantum entanglement resources to many users. Despite these remarkable advances, the scalability of the architecture could be constrained by the finite spectrum resource, where O(N^2)wavelength channels are needed to connect N users, thus impeding further progress in real-world scenarios. Here, we propose an optimized scheme for the wavelength division multiplexing entanglement-based network using a state-multiplexing quantum light source. With a dual-pump configuration, the feasibility of our approach is demonstrated by generating state-multiplexing photon pairs at multiple wavelength channels with a silicon nitride microring resonator chip. In our demonstration, we establish a fully connected graph between four users with six wavelength channels - saving half of which without sacrificing functionality and performance of the secure communication. A total asymptotic secure key rate of 1946.9 bps is obtained by performing the BBM92 protocol with the distributed state. The network topology of our method has great potential for developing a scalable quantum network with significantly minimized infrastructure requirements.

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Yun-Ru Fan, Yue Luo, Kai Guo, Jin-Peng Wu, Hong Zeng, Guang-Wei Deng, You Wang, Hai-Zhi Song, Zhen Wang, Li-Xing You, Guang-Can Guo, Qiang Zhou. 2025-02-27. Optimized quantum entanglement network enabled by a state-multiplexing quantum light source. https://arxiv.org/abs/2502.19740

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