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Quantum key distribution over 658 km fiber with distributed vibration sensing | | Jiu-Peng Chen
; Chi Zhang
; Yang Liu
; Cong Jiang
; Dong-Feng Zhao
; Wei-Jun Zhang
; Fa-Xi Chen
; Hao Li
; Li-Xing You
; Zhen Wang
; Yang Chen
; Xiang-Bin Wang
; Qiang Zhang
; Jian-Wei Pan
; | | Date: |
22 Oct 2021 | | Abstract: | Twin-field quantum key distribution (TF-QKD) promises ultra-long secure key
distribution which surpasses the rate distance limit and can reduce the number
of the trusted nodes in long-haul quantum network. Tremendous efforts have been
made towards implementation of TF-QKD, among which, the secure key with finite
size analysis can distribute more than 500 km in the lab and in the field.
Here, we demonstrate the sending-or-not-sending TF-QKD experimentally,
achieving a secure key distribution with finite size analysis over 658 km
ultra-low-loss optical fiber, improve the secure distance record by around 100
km. Meanwhile, in a TF-QKD system, any phase fluctuation due to temperature
variation and ambient variation during the channel must be recorded and
compensated, and all these phase information can then be utilized to sense the
channel vibration perturbations. With our QKD system, we recovered the external
vibrational perturbations on the fiber generated by an artificial vibroseis and
successfully located the perturbation position with a resolution better than 1
km. Our results not only set a new distance record of QKD, but also demonstrate
that the redundant information of TF-QKD can be used for remote sensing of the
channel vibration, which can find applications in earthquake detection and
landslide monitoring besides secure communication. | | Source: | arXiv, 2110.11671 | | Services: | Forum | Review | PDF | Favorites | |
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