Entanglement distribution over metropolitan fiber using on-chip broadband polarization entangled photon source

• URL: http://arxiv.org/abs/2503.07198v1
• Date: Mon, 10 Mar 2025 11:31:10 GMT
• Title: Entanglement distribution over metropolitan fiber using on-chip broadband polarization entangled photon source
• Authors: Ziheng Jiang, Wenhan Yan, Chi Lu, Yikai Chen, Wenjun Wen, Yu-Yang An, Leizhen Chen, Yanqing Lu, Shining Zhu, Xiao-Song Ma,
• Abstract summary: 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.<n>Our results showcase the potential of silicon photonic technology as a scalable and practical platform for quantum technologies.
• Score: 3.5286380555530186
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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