Reset dynamics and latching in niobium superconducting nanowire single-photon detectors

Annunziata, A.J. et al. (2010) Reset dynamics and latching in niobium superconducting nanowire single-photon detectors. Journal of Applied Physics, 108(8), 084507. (doi:10.1063/1.3498809)

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Abstract

We study the reset dynamics of niobium (Nb) superconducting nanowire single-photon detectors (SNSPDs) using experimental measurements and numerical simulations. The numerical simulations of the detection dynamics agree well with experimental measurements, using independently determined parameters in the simulations. We find that if the photon-induced hotspot cools too slowly, the device will latch into a dc resistive state. To avoid latching, the time for the hotspot to cool must be short compared to the inductive time constant that governs the resetting of the current in the device after hotspot formation. From simulations of the energy relaxation process, we find that the hotspot cooling time is determined primarily by the temperature-dependent electron-phonon inelastic time. Latching prevents reset and precludes subsequent photon detection. Fast resetting to the superconducting state is, therefore, essential, and we demonstrate experimentally how this is achieved. We compare our results to studies of reset and latching in niobium nitride SNSPDs.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Casaburi, Dr Alessandro
Authors: Annunziata, A.J., Quaranta, O., Santavicca, D.F., Casaburi, A., Frunzio, L., Ejrnaes, M., Rooks, M.J., Cristiano, R., Pagano, S., Frydman, A., and Prober, D.E.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Applied Physics
Publisher:American Institute of Physics
ISSN:0021-8979
Published Online:22 October 2010

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