Universitè De Genève

Boris Korzh

Hugo Zbinden

Charles Lim

Gianluca Boso

The invention relates to a Quantum Key Distribution system comprising a transmitterand a receiverfor exchanging a quantum key via a quantum channelthrough a decoy-state three state protocol wherein the transmitter comprises a transmitter processing unitadapted 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 sourceadapted to generate an optical pulse, a time-bin interferometerthrough 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 modulatoradapted to change the intensity of the two pulses individually according to the choice made by the transmitter processing unit, and a variable optical attenuatoradapted to reduce the overall signal intensity to the optimum photon number per pulse.

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Flint, United Kingdom

Boris Korzh