FIBRE-OPTIC QUANTUM COMPUTER (VERSIONS) Russian patent published in 2024 - IPC G06N10/00 G06N10/40 

FIELD: computer engineering.

SUBSTANCE: group of inventions relates to the design of a fibre-optic quantum computer. In one version, the optical quantum computer includes a laser generating in the near infrared region, nonlinear crystal configured to form biphotons having quantum entanglement at the output of the optical beam, installed on the path of the beam of biphotons, a first channel including a quantum register consisting of N quantum qubits, including an optical splitter into N optical channels, N electrooptic modulators connected to digital computer, quantum processor of 2N optical linear multibeam Mach—Zehnder interferometers, the input of which is optically connected to the outputs of N electrooptical modulators, optical outputs of interferometers are connected to single-photon photodetectors, outputs of which are connected to control digital computer, and additionally comprises a second channel identical to the first, as a laser, an injection single-frequency semiconductor laser with an output power stabilization system is selected, as a nonlinear crystal, an anisotropic negative nonlinear crystal is selected, which is aligned in a non-linear optical scheme with the possibility of forming two spatially spaced optical beams of biphotons from a beam of biphotons, two micro-lenses for inputting optical beams of biphotons into two identical optical channels made on single-mode fibres, splitter is made of fibre and is connected to electrooptic modulators, which are integrated amplitude-phase electrooptical modulators, at the output of which there is an optical system of quarter-wave and half-wave plates and a polariser in each channel of the quantum register, and each of two identical optical quantum processors consists of single-mode isotropic optical fibres, single-photon photodetectors contain time-to-digital converters connected to a digital computer.

EFFECT: reduced level of polarization amplitude-frequency noise in an optical quantum processor.

2 cl, 2 dwg