FIELD: physics.
SUBSTANCE: invention relates to systems with quantum distribution of encryption keys. Transmitter pulse shaping unit includes a pulse laser, an electronic control device containing a random number sensor, laser control driver, clock pulse generator, and configured to select the type of state using a random number sensor, generation of control signals corresponding to the selected states, supply of control signals to the laser control driver. It is proposed to generate trap states by means of laser pulse duration modulation, at that moment of the beginning of generation of each trap state varies in a random manner.
EFFECT: reduced distinguishability of information states and states of traps during implementation of the method of traps as part of the protocol of quantum key distribution.
1 cl, 2 dwg
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