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Twin-Field Quantum Key Distribution over 511 km Optical Fiber Linking two Distant Metropolitans
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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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Cited by 1 Pith paper
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Topological State-Aware Simulation Framework for Inter-Satellite Twin-Field QKD Networks
A satellite twin-field QKD simulation with a topological data-analysis gate shows no rate advantage over the same gate without TDA, and the authors state the full composable-security proof remains incomplete.
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