Single microwave photon detection method and device based on superconducting chip and cold atoms

Abstract

The invention discloses a single microwave photon detection method and device based on a superconducting chip and cold atoms. The method comprises the following steps: S1, obtaining a muK-magnitude cold atom ensemble in a specific polarization state; s2, constructing a cold atom and resonant cavity coupling system; s3, simultaneously applying a resonant microwave signal released by the resonant cavity and at least two laser beams provided by a laser module to the cold atom ensemble, and converting the absorbed microwave photons into optical signal photons with a predetermined wavelength through a four-wave mixing effect; and S4, carrying out screening processing on the generated optical signal photons, and introducing the screened and purified signal photons into a photon detection module so as to carry out single photon detection and identification. A microwave signal is directly output through the superconducting chip integrated resonant cavity so as to omit an external microwave source, cold atoms are accurately confined near the resonant cavity by using a magnetic trap so as to enhance coupling, and finally, efficient conversion and detection from single microwave photons to optical photons are realized in combination with a laser-induced four-wave mixing effect.

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