Independent Optical Frequency Combs Powered 546 km Field Test of Twin-Field Quantum Key Distribution

• URL: http://arxiv.org/abs/2411.13943v1
• Date: Thu, 21 Nov 2024 08:54:03 GMT
• Title: Independent Optical Frequency Combs Powered 546 km Field Test of Twin-Field Quantum Key Distribution
• Authors: Lai Zhou, Jinping Lin, Chengfang Ge, Yuanbin Fan, Zhiliang Yuan, Hao Dong, Yang Liu, Di Ma, Jiu-Peng Chen, Cong Jiang, Xiang-Bin Wang, Li-Xing You, Qiang Zhang, Jian-Wei Pan,
• Abstract summary: We verify in field the viability of using independent optical frequency combs. We record a finite-size secure key rate (SKR) of 0.53bit/s and an asymmetry of 0.12 bit/s. Our work marks an important step towards incorporation of long-haul fiber links into large quantum networks.
• Score: 11.624641255237634
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• Abstract: Owing to its repeater-like rate-loss scaling, twin-field quantum key distribution (TF-QKD) has repeatedly exhibited in laboratory its superiority for secure communication over record fiber lengths. Field trials pose a new set of challenges however, which must be addressed before the technology's roll-out into real-world. Here, we verify in field the viability of using independent optical frequency combs -- installed at sites separated by a straight-line distance of 300~km -- to achieve a versatile TF-QKD setup that has no need for optical frequency dissemination and thus enables an open and network-friendly fiber configuration. Over 546 and 603 km symmetric links, we record a finite-size secure key rate (SKR) of 0.53~bit/s and an asymptotic SKR of 0.12 bit/s, respectively. Of practical importance, the setup is demonstrated to support 44~km fiber asymmetry in the 452 km link. Our work marks an important step towards incorporation of long-haul fiber links into large quantum networks.

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