Twin-Field Quantum Key Distribution over 511 km Optical Fiber Linking
two Distant Metropolitans
- URL: http://arxiv.org/abs/2102.00433v1
- Date: Sun, 31 Jan 2021 11:25:00 GMT
- Title: Twin-Field Quantum Key Distribution over 511 km Optical Fiber Linking
two Distant Metropolitans
- Authors: Jiu-Peng Chen, Chi Zhang, Yang Liu, Cong Jiang, Wei-Jun Zhang,
Zhi-Yong Han, Shi-Zhao Ma, Xiao-Long Hu, Yu-Huai Li, Hui Liu, Fei Zhou,
Hai-Feng Jiang, Teng-Yun Chen, Hao Li, Li-Xing You, Zhen Wang, Xiang-Bin
Wang, Qiang Zhang, Jian-Wei Pan
- Abstract summary: We complete a twin field QKD (TF-QKD) and distribute secure keys without any trusted repeater over a 511 km long haul fiber trunk.
Our secure key rate is around 3 orders of magnitudes greater than what is expected if the previous QKD field test system over the same length were applied.
The efficient quantum-state transmission and stable single-photon interference over such a long distance deployed fiber paves the way to large-scale fiber quantum networks.
- Score: 21.87659562677264
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The basic principle of quantum mechanics guarantee the unconditional security
of quantum key distribution (QKD) at the cost of inability of amplification of
quantum state. As a result, despite remarkable progress in worldwide
metropolitan QKD networks over the past decades, long haul fiber QKD network
without trustful relay has not been achieved yet. Here, through
sending-or-not-sending (SNS) protocol, we complete a twin field QKD (TF-QKD)
and distribute secure keys without any trusted repeater over a 511 km long haul
fiber trunk linking two distant metropolitans. Our secure key rate is around 3
orders of magnitudes greater than what is expected if the previous QKD field
test system over the same length were applied. The efficient quantum-state
transmission and stable single-photon interference over such a long distance
deployed fiber paves the way to large-scale fiber quantum networks.
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