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1. (WO2018202698) APPARATUS AND METHOD FOR DECOY-STATE THREE-STATE QUANTUM KEY DISTRIBUTION

Pub. No.:    WO/2018/202698    International Application No.:    PCT/EP2018/061185
Publication Date: Fri Nov 09 00:59:59 CET 2018 International Filing Date: Thu May 03 01:59:59 CEST 2018
IPC: H04B 10/54
H04L 9/08
Applicants: UNIVERSITÉ DE GENÈVE
Inventors: ZBINDEN, Hugo
KORZH, Boris
LIM, Charles
BOSO, Gianluca
Title: APPARATUS AND METHOD FOR DECOY-STATE THREE-STATE QUANTUM KEY DISTRIBUTION
Abstract:
The invention relates to a Quantum Key Distribution system comprising a transmitter (300) and a receiver (400) for exchanging a quantum key via a quantum channel (600) through a decoy-state three state protocol wherein the transmitter comprises a transmitter processing unit (340) adapted to use random numbers from a quantum random generator to select a quantum state to encode from different states of intensity and basis,a Pulsed light source (310) adapted to generate an optical pulse, a time-bin interferometer (320) through which the generated optical pulse passes and which transforms generated optical pulse into two coherent pulses separated by the time bin duration,a single intensity modulator (360) adapted to change the intensity of the two pulses individually according to the choice made by the transmitter processing unit (340), and a variable optical attenuator (370) adapted to reduce the overall signal intensity to the optimum photon number per pulse.