METHOD AND DEVICE FOR QUANTUM KEY DISTRIBUTION Russian patent published in 2024 - IPC H04L9/08 H04B10/70 

FIELD: physics.

SUBSTANCE: invention relates to a method and a device for quantum key distribution. In the quantum key distribution method, test optical signals on the sender side are generated with polarization states corresponding to Stokes vectors:

and transmitting them from the sender to the recipient for each j-th basis, at the same time on the recipient's side performing the polarization of the test signals until the corresponding j-th basis of the receiver is aligned with the S_l axis on the Poincaré sphere, measured are polarization intensity projections P_x1j, P_x2j, P_x3j and P_y1j, P_y2j, P_y3j, for two orthogonal polarization planes of each received test signal, measured values are used to calculate projections t_1j, t_2j, and t_3j of Stokes vectors of the received test signals on the axis S_l of the Poincaré sphere according to the following:

distorted key signals respectively K^/_0j and K^/_1j, on the sender side is formed according to the following:

and on the receiver side, the polarization plane is rotated until the display of the receiver base is aligned with the S_l axis on the Poincaré sphere and the polarization state of the key signals is recorded K_0j and K_1j, as polarization intensity projections respectively P_xj and P_yj for two orthogonal polarization planes of each received key signal.

EFFECT: simplification of the method and device for quantum key distribution by eliminating the need to perform matrix calculations and corresponding means for their implementation.

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