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We report the operation of a gigahertz clocked quantum key distribution system featuring high composable and quantifiable security while maintaining more than 1 Mbit/s secure key rate over a 50 km quantum channel.
We demonstrate multi-gigahertz photon-counting at 1550nm using self-differencing In-GaAs APDs. The quantum efficiency is characterized as 23.5% at an after-pulse probability of 4.84%. The device will further increase the bit-rate for fiber quantum key distribution.
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