Single-photon detection using high-temperature superconductor

The detection of individual quanta of light is essential for a range of applications, and so superconducting-nanowire single-photon detectors (SNSPDs) have become increasingly important due to their high detection efficiency and signal-to-noise ratio. However, usual SNSPDs require costly cryocoolers to operate. A new study has reported the fabrication of two types of high-temperature superconducting nanowires. This expands the family of materials available for SNSPD technology beyond the usual liquid helium temperature limit, and further research may even lead to operation at even higher temperatures.

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