A two-laser, modulator-free transmitter prepares time-bin QKD states, and a decoy-free three-state protocol is analyzed, giving an estimated secure range near 40 km.
The characters ‘0’ and ‘1’ are cho- sen with the probabilitypA Z /2, and the character ‘+’ is chosen with the probabilitypA X
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Modulator-free transmitter for quantum key distribution in metropolitan area networks
A two-laser, modulator-free transmitter prepares time-bin QKD states, and a decoy-free three-state protocol is analyzed, giving an estimated secure range near 40 km.