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Long-distance free-space measurement-device-independent quantum key distribution | | Yuan Cao
; Yu-Huai Li
; Kui-Xing Yang
; Yang-Fan Jiang
; Shuang-Lin Li
; Xiao-Long Hu
; Maimaiti Abulizi
; Cheng-Long Li
; Weijun Zhang
; Qi-Chao Sun
; Wei-Yue Liu
; Xiao Jiang
; Sheng-Kai Liao
; Ji-Gang Ren
; Hao Li
; Lixing You
; Zhen Wang
; Juan Yin
; Chao-Yang Lu
; Xiang-Bin Wang
; Qiang Zhang
; Cheng-Zhi Peng
; Jian-Wei Pan
; | | Date: |
9 Jun 2020 | | Abstract: | Measurement-device-independent quantum key distribution (MDI-QKD), based on
two-photon interference, is immune to all attacks against the detection system
and allows a QKD network with untrusted relays. Since the MDI-QKD protocol was
proposed, fibre-based implementations have been rapidly developed towards
longer distance, higher key rates, and network verification. However, owing to
the effect of atmospheric turbulence, MDI-QKD over free-space channel remains
experimentally challenging. Here, by developing the robust adaptive optics
system, high precision time synchronization and frequency locking between
independent photon sources located far apart, we realised the first free-space
MDI-QKD over a 19.2-km urban atmospheric channel, which well exceeds the
effective atmospheric thickness. Our experiment takes the first step towards
satellite-based MDI-QKD. Moreover, the technology developed here opens the way
to quantum experiments in free space involving long-distance interference of
independent single photons. | | Source: | arXiv, 2006.5088 | | Services: | Forum | Review | PDF | Favorites | |
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