METHOD FOR FILTERING PHOTONS FROM THE RESIDUAL RADIATION OF COHERENT PUMPING Russian patent published in 2022 - IPC G02B5/28 

FIELD: quantum optics.

SUBSTANCE: invention relates to the field of quantum optics and quantum information and concerns a pumping filtration method for sources of quantum states. The method involves feeding to M inputs of an N-channel interferometer, characterized by a transfer matrix U of size N by N, generated photons from M photon sources with residual coherent pumping signals from at least one laser radiation source. Coherent pumping signals when using the continuous mode are formed with the same frequency spectrum and the same polarization, and when using the pulse mode, coherent pumping pulses of the same polarization form and with matching central frequencies of their spectrum are formed, which are fed synchronously to the N-channel interferometer. The transfer matrix U is designed with the ability to focus coherent pumping input signals, including residual coherent pumping signals from photon sources, to at least one output, and output part of the photons from photon sources to the remaining outputs.

EFFECT: reducing losses during filtration, providing the possibility of filtering photons generated by multiple sources by one device and the possibility of filtering radiation when the polarization of radiation coincides with the polarization of the generated photons.

7 cl, 9 dwg