Entanglement distribution over metropolitan fiber using on-chip broadband polarization entangled photon source
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866929751519657984 |
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| author | Jiang, Ziheng Yan, Wenhan Lu, Chi Chen, Yikai Wen, Wenjun An, Yu-Yang Chen, Leizhen Lu, Yanqing Zhu, Shining Ma, Xiao-Song |
| author_facet | Jiang, Ziheng Yan, Wenhan Lu, Chi Chen, Yikai Wen, Wenjun An, Yu-Yang Chen, Leizhen Lu, Yanqing Zhu, Shining Ma, Xiao-Song |
| contents | Entangled photon pairs are of crucial importance in quantum networks. For the future demands of large-scale and secure quantum communication, integrated photon sources are highly effective solutions. Here, we report entanglement distribution over a 30 km metropolitan area using on-chip broadband silicon nanowire biphoton polarization entangled source based on a silicon-on-insulator (SOI) platform. This source generates a continuous spectrum spanning the entire C-band (4.5 THz), achieving a locally detected coincidence counts of about 154 kHz within 100GHz bandwidth, making it suitable for long-distance entanglement distribution among multiple users. By combining this source with quantum entanglement, enhanced by high-precision clock synchronization that achieves an Allan variance of 56.8 ps over 600s, we observe a violation of the CHSH inequality by 27.8 standard deviations. Our results showcase the potential of silicon photonic technology as a scalable and practical platform for quantum technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_07198 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Entanglement distribution over metropolitan fiber using on-chip broadband polarization entangled photon source Jiang, Ziheng Yan, Wenhan Lu, Chi Chen, Yikai Wen, Wenjun An, Yu-Yang Chen, Leizhen Lu, Yanqing Zhu, Shining Ma, Xiao-Song Quantum Physics Entangled photon pairs are of crucial importance in quantum networks. For the future demands of large-scale and secure quantum communication, integrated photon sources are highly effective solutions. Here, we report entanglement distribution over a 30 km metropolitan area using on-chip broadband silicon nanowire biphoton polarization entangled source based on a silicon-on-insulator (SOI) platform. This source generates a continuous spectrum spanning the entire C-band (4.5 THz), achieving a locally detected coincidence counts of about 154 kHz within 100GHz bandwidth, making it suitable for long-distance entanglement distribution among multiple users. By combining this source with quantum entanglement, enhanced by high-precision clock synchronization that achieves an Allan variance of 56.8 ps over 600s, we observe a violation of the CHSH inequality by 27.8 standard deviations. Our results showcase the potential of silicon photonic technology as a scalable and practical platform for quantum technologies. |
| title | Entanglement distribution over metropolitan fiber using on-chip broadband polarization entangled photon source |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.07198 |