Optical Single-Photon Detection in Micrometer-Scale NbN Bridges

Yu P. Korneeva, D. Yu Vodolazov, A. V. Semenov, I. N. Florya, N. Simonov, E. Baeva, A. A. Korneev, G. N. Goltsman, T. M. Klapwijk

    Research output: Contribution to journalArticleScientificpeer-review

    44 Citations (Scopus)


    We demonstrate experimentally that single-photon detection can be achieved in micrometer-wide NbN bridges, with widths ranging from 0.53 to 5.15 μm and for photon wavelengths of 408 to 1550 nm. The microbridges are biased with a dc current close to the experimental critical current, which is estimated to be about 50% of the theoretically expected depairing current. These results offer an alternative to the standard superconducting single-photon detectors, based on nanometer-scale nanowires implemented in a long meandering structure. The results are consistent with improved theoretical modeling based on the theory of nonequilibrium superconductivity, including the vortex-assisted mechanism of initial dissipation.

    Original languageEnglish
    Article number064037
    JournalPhysical Review Applied
    Issue number6
    Publication statusPublished - 2018


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