High-dimensional quantum key distribution using energy-time entanglement over 242 km partially deployed fiber
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Published:2023-10-12
Issue:1
Volume:9
Page:015003
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ISSN:2058-9565
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Container-title:Quantum Science and Technology
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language:
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Short-container-title:Quantum Sci. Technol.
Author:
Liu JingyuanORCID,
Lin Zhihao,
Liu Dongning,
Feng Xue,
Liu Fang,
Cui Kaiyu,
Huang Yidong,
Zhang WeiORCID
Abstract
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). The QKD is realized through the protocol of dispersive-optics QKD (DO-QKD) with high-dimensional encoding to utilize coincidence counts more efficiently. A reliable, high-accuracy time synchronization technology for long-distance entanglement-based QKD is developed based on the distribution of optical pulses in quantum channels. Our system operates continuously for more than 7 d without active polarization or phase calibration. We ultimately generate secure keys with secure key rates of 0.22 bps and 0.06 bps in the asymptotic and finite-size regimes, respectively. It shows that entanglement-based DO-QKD is reliable for long-distance realization in the field if its high requirement on time synchronization is satisfied.
Funder
National Natural Science Foundation of China
Tsinghua Initiative Scientific Research Program
Natural Science Foundation of Beijing Municipality
National Key R&D Program of China
Tsinghua University-Zhuhai Huafa Industrial Share Company Joint Institute for Architecture Optoelectronic Technologies
Subject
Electrical and Electronic Engineering,Physics and Astronomy (miscellaneous),Materials Science (miscellaneous),Atomic and Molecular Physics, and Optics
Cited by
1 articles.
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