Abstract
The discovery of high-temperature superconductors has led to great efforts to find potential applications, including the development of photon detectors. We review the limitations of the different approaches proposed for realizing superconducting photon detectors. The structure and operation of a new quantum superconducting kinetic inductance detector (QSKID) with a SQUID readout circuit is described. The QSKID is made from a superconducting loop where the photosignals are generated in response to photoinduced changes in the condensate's kinetic inductance. The QSKID operates in the zero-resistance superconducting state, thereby circumventing Johnson noise.
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