Secure Communication Breakthrough: 1,000+ km Quantum Key Distribution Achieved — A point-to-point long-dist |
Researchers from several Chinese institutions have set a new world record by achieving a non-relay quantum key distribution over 1,002 km. This advancement, utilizing twin-field QKD, ultra-low-loss fiber, and ultra-low-noise superconducting single-photon detectors, signifies a major step towards high-speed intercity quantum communication networks.
The twin-field QKD using sending-or-not-sending protocol was demonstrated in the experiment, improving the relation between the key rate and channel transmittance from a linear η to its square root η. Therefore, it can achieve a much longer secure distance than traditional QKD protocols. Based on the aforementioned technological developments, the team achieved TF-QKD over a record distance of 1002 km, with a key rate of 0.0034 bps. This work not only verifies the feasibility of the SNS-TF-QKD scheme at extremely long distances but also demonstrates that this protocol can achieve high key rates in many practical scenarios.
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