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Three temperature regimes in superconducting photon detectors: Quantum, thermal and multiple phase-slips as generators of dark countsстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Murphy A., Semenov A., Korneev A., Korneeva Y., Goltsman G., Bezryadin A.
- Журнал: Scientific reports
- Том: 5
- Номер: 10174
- Год издания: 2015
- Издательство: Nature Publishing Group
- Местоположение издательства: United Kingdom
- DOI: 10.1038/srep10174
- Аннотация: We perform measurements of the switching current distributions of three w nm wide, 4 nm thick NbN superconducting strips which are used for single-photon detectors. These strips are much wider than the diameter of the vortex cores, so they are classified as quasi-two-dimensional (quasi-2D). We discover evidence of macroscopic quantum tunneling by observing the saturation of the standard deviation of the switching distributions at temperatures around 2K. We analyze our results using the Kurkijärvi-Garg model and find that the escape temperature also saturates at low temperatures, confirming that at sufficiently low temperatures, macroscopic quantum tunneling is possible in quasi-2D strips and can contribute to dark counts observed in single photon detectors. At the highest temperatures the system enters a multiple phase-slip regime. In this range single phase-slips are unable to produce dark counts and the fluctuations in the switching current are reduced.
- Добавил в систему: Гольцман Григорий Наумович