Session 2

[ICNN3-02] Current-crowding-free superconducting nanowire single-photon detectors enabled by local helium ion irradiation

*Stefan Strohauer¹, Fabian Wietschorke², Christian Schmid², Stefanie Grotowski¹, Lucio Zugliani², Rasmus Flaschmann², Björn Jonas², Kai Mueller², Jonathan Finley¹ (1. Walter Schottky Institute and School of Natural Sciences, Technical University of Munich, Germany, 2. Walter Schottky Institute and School of Computation, Information and Technology, Technical University of Munich, Germany)

Local helium ion irradiation is utilized to enhance the sensitivity of superconducting nanowire single-photon detectors (SNSPDs) while preserving the high switching current of unirradiated SNSPDs. This enables current-crowding-free SNSPDs with unity internal quantum efficiency for 1550 nm photons.