The effect of magnetic field on the intrinsic detection efficiency of superconducting single-photon detectors

J. J. Renema, R. J. Rengelink, I. Komen, Q. Wang, R. Gaudio, K. P M Op'T Hoog, Z. Zhou, D. Sahin, A. Fiore, P. Kes, J. Aarts, M. P. Van Exter, M. J A De Dood, E. F C Driessen

Research output: Contribution to journalArticle (Academic Journal)peer-review

12 Citations (Scopus)

Abstract

We experimentally investigate the effect of a magnetic field on photon detection in superconducting single-photon detectors (SSPDs). At low fields, the effect of a magnetic field is through the direct modification of the quasiparticle density of states of the superconductor, and magnetic field and bias current are interchangeable, as is expected for homogeneous dirty-limit superconductors. At the field where a first vortex enters the detector, the effect of the magnetic field is reduced, up until the point where the critical current of the detector starts to be determined by flux flow. From this field on, increasing the magnetic field does not alter the detection of photons anymore, whereas it does still change the rate of dark counts. This result points at an intrinsic difference in dark and photon counts, and also shows that no enhancement of the intrinsic detection efficiency of a straight SSPD wire is achievable in a magnetic field.

Original languageEnglish
Article number092602
JournalApplied Physics Letters
Volume106
Issue number9
DOIs
Publication statusPublished - 2 Mar 2015

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