Superconducting Detector That Counts Microwave Photons Up to Two
Andrii M. Sokolov, Frank K. Wilhelm
DOI 10.1103/PhysRevApplied.14.064063 · Physical Review Applied
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Abstract
We propose a detector of microwave photons that can distinguish the vacuum state, one-photon state, and the states with two or more photons. Its operation is based on the two-photon transition in a biased Josephson junction and detection occurs when it switches from a superconducting to a normal state. We model the detector theoretically. The detector performs with more than 90% success probability in several microseconds. The working frequency can be set at the design stage in the range from about 1 to 20 GHz.
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