Fig. 2: Secret key rate R versus channel loss for Protocol I. | Communications Physics

Fig. 2: Secret key rate R versus channel loss for Protocol I.

From: Optimized protocol for twin-field quantum key distribution

Fig. 2

The curves represent the secure key rate of twin-field quantum key distribution protocol for M = 1, M = 2, and M = 4 (M is the number of random phases) and the Pirandola–Laurenza–Ottaviani–Banchi (PLOB) bound, respectively. We do not show the case of M → ∞ because the key rate tends to 0.

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