Nonlinear waveguide of entangled quantum light source and generation method thereof

The invention relates to the technical field of quantum, and provides a nonlinear waveguide of an entangled quantum light source and a generation method thereof. The nonlinear waveguide of the entangled quantum light source comprises a waveguide front end, a chip and a narrow-band band-pass filter, and the narrow-band band-pass filter is integrated on the chip; and the waveguide main body is arranged on the chip and is located at the downstream of the waveguide front end, and the waveguide main body is used for generating a nonlinear optical waveguide of an entangled photon pair based on the light source processed by the narrow-band band-pass filter. The nonlinear waveguide of the entangled quantum light source can enable the filtering passband of the narrow-band band-pass filter not to be overlapped with the output wavelength range of the entangled photon pair; the influence of noise photons generated in the transmission process before pumping laser enters a chip can be removed. And then pumping laser is inp