High-dimensional quantum key distribution using energy-time entanglement over 242 km partially deployed fiber

• URL: http://arxiv.org/abs/2212.02695v1
• Date: Tue, 6 Dec 2022 01:37:57 GMT
• Title: High-dimensional quantum key distribution using energy-time entanglement over 242 km partially deployed fiber
• Authors: Jingyuan Liu, Zhihao Lin, Dongning Liu, Xue Feng, Fang Liu, Kaiyu Cui, Yidong Huang, Wei Zhang
• Abstract summary: Entanglement-based quantum key distribution (QKD) is an essential ingredient in quantum communication. We report an experimental QKD using energy-time entangled photon pairs that transmit over optical fibers of 242 km. We generate secure keys with secure key rates of 0.22 bps and 0.06 bps in and finite-size regime.
• Score: 8.905152890117282
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Entanglement-based quantum key distribution (QKD) is an essential ingredient in quantum communication, owing to the property of source-independent security and the potential on constructing large-scale quantum communication networks. However, implementation of entanglement-based QKD over long-distance optical fiber links is still challenging, especially over deployed fibers. In this work, we report an experimental QKD using energy-time entangled photon pairs that transmit over optical fibers of 242 km (including a section of 19 km deployed fibers). High-quality entanglement distribution is verified by Franson-type interference with raw fringe visibilities of 94.1$\pm$1.9% and %92.4$\pm$5.4% in two non-orthogonal bases. The QKD is realized through the protocol of dispersive-optics QKD. A high-dimensional encoding is applied to utilize coincidence counts more efficiently. Using reliable, high-accuracy time synchronization technology, the system operates continuously for more than 7 days, even without active polarization or phase calibration. We ultimately generate secure keys with secure key rates of 0.22 bps and 0.06 bps in asymptotic and finite-size regime,respectively. This system is compatible with existing telecommunication infrastructures, showing great potential on realizing large-scale quantum communication networks in future.

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