2024
DOI: 10.1103/physrevresearch.6.043300
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Tight scaling of key rate for differential-phase-shift quantum key distribution

Akihiro Mizutani,
Toyohiro Tsurumaru

Abstract: The performance of quantum key distribution protocols is evaluated based on the ease of implementation and key generation rate. Among major protocols, the differential-phase-shift (DPS) protocol has the advantage of simple implementation using a train of coherent pulses and a passive detection unit. Unfortunately, however, its key rate is known to be at least proportional to η2 with respect to channel transmission η→0. If one can only prove the rate proportional to η2 and cannot improve the analysis beyond tha… Show more

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