A Metropolitan-scale Multiplexed Quantum Repeater with Bell Nonlocality
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915938321825792 |
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| author | Zhu, Tian-Xiang Zhang, Chao Ou, Zhong-Wen Liu, Xiao Liang, Peng-Jun Hu, Xiao-Min Huang, Yun-Feng Zhou, Zong-Quan Li, Chuan-Feng Guo, Guang-Can |
| author_facet | Zhu, Tian-Xiang Zhang, Chao Ou, Zhong-Wen Liu, Xiao Liang, Peng-Jun Hu, Xiao-Min Huang, Yun-Feng Zhou, Zong-Quan Li, Chuan-Feng Guo, Guang-Can |
| contents | Quantum repeaters can overcome exponential photon loss in optical fibers, enabling heralded entanglement between distant quantum memories. The definitive benchmark for this entanglement is Bell nonlocality; however, recent metropolitan-scale demonstrations based on single-photon interference (SPI) schemes have been limited to generating low-quality entanglement, falling short of Bell nonlocality certification. Here, we introduce a multiplexed quantum repeater protocol based on time measurements (MQR-TM), successfully combining the high heralding rate of SPI schemes with the phase robustness of two-photon interference (TPI) schemes. This approach achieves heralded entanglement distribution between two solid-state quantum memories over a record 14.5~km separation, generating a Bell state with a fidelity of $78.6 \pm 2.0\%$. We observe a CHSH-Bell inequality violation by 3.7 standard deviations, marking the first certification of Bell nonlocality in metropolitan-scale quantum repeaters. Our architecture supports autonomous quantum node operation without fiber channel phase stabilization, offering a practical framework for scalable quantum-repeater networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_17940 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Metropolitan-scale Multiplexed Quantum Repeater with Bell Nonlocality Zhu, Tian-Xiang Zhang, Chao Ou, Zhong-Wen Liu, Xiao Liang, Peng-Jun Hu, Xiao-Min Huang, Yun-Feng Zhou, Zong-Quan Li, Chuan-Feng Guo, Guang-Can Quantum Physics Quantum repeaters can overcome exponential photon loss in optical fibers, enabling heralded entanglement between distant quantum memories. The definitive benchmark for this entanglement is Bell nonlocality; however, recent metropolitan-scale demonstrations based on single-photon interference (SPI) schemes have been limited to generating low-quality entanglement, falling short of Bell nonlocality certification. Here, we introduce a multiplexed quantum repeater protocol based on time measurements (MQR-TM), successfully combining the high heralding rate of SPI schemes with the phase robustness of two-photon interference (TPI) schemes. This approach achieves heralded entanglement distribution between two solid-state quantum memories over a record 14.5~km separation, generating a Bell state with a fidelity of $78.6 \pm 2.0\%$. We observe a CHSH-Bell inequality violation by 3.7 standard deviations, marking the first certification of Bell nonlocality in metropolitan-scale quantum repeaters. Our architecture supports autonomous quantum node operation without fiber channel phase stabilization, offering a practical framework for scalable quantum-repeater networks. |
| title | A Metropolitan-scale Multiplexed Quantum Repeater with Bell Nonlocality |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2508.17940 |