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Heterodyne spectroscopy with superconducting single-photon detector

P. 01005.
Lobanov Y., Shcherbatenko M., Semenov A., Kovalyuk V., Korneev A., Goltsman G.

We demonstrate successful operation of a Superconducting Single Photon Detector (SSPD) as the core element in a heterodyne receiver. Irradiating the SSPD by both a local oscillator power and signal power simultaneously, we observed beat signal at the intermediate frequency of a few MHz. Gain bandwidth was found to coincide with the detector single pulse width, where the latter depends on the detector kinetic inductance, determined by the superconducting nanowire length.