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Unconditional security of sending or not sending twin-field quantum key distribution with finite pulses
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abstract
The Sending-or-Not-Sending protocol of the twin-field quantum key distribution (TF-QKD) has its advantage of unconditional security proof under any coherent attack and fault tolerance to large misalignment error. So far this is the only coherent-state based TF-QKD protocol that has considered finite-key effect, the statistical fluctuations. Here we consider the complete finite-key effects for the protocol and we show by numerical simulation that the protocol with typical finite number of pulses in practice can produce unconditional secure final key under general attack, including all coherent attacks. It can exceed the secure distance of 500 $km$ in typical finite number of pulses in practice even with a large misalignment error.
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Cited by 1 Pith paper
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General sending-or-not-sending twin field protocol for quantum key distribution with asymmetric source parameters
A security proof and simulation show that SNS twin-field QKD can be run with fully asymmetric source parameters while retaining security and substantially improving key rates on asymmetric channels.
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