Method for reducing dark count of superconducting single-photon detector and superconducting single-photon detector device

The invention provides a method for reducing dark count of a superconducting single-photon detector and a superconducting single-photon detector device, and the method comprises the steps: 1) calculating and designing an optical filter through a model according to the demands, and processing to form the optical filter; 2) providing a superconducting nanowire single-photon detector chip, and fixing the optical filter on the upper surface of the superconducting nanowire single-photon detector chip; and 3) the optical filter, the superconducting nanowire single-photon detector chip and an optical fiber are packaged together, the optical fiber and the optical filter are oppositely arranged, the distance between the optical fiber and the optical filter is adjusted to realize focusing, and the superconducting nanowire single-photon detector device is obtained. According to the invention, a compact, universal and convenient low-loss and low-temperature filtering method is constructed; the strong suppression effect o