Materials for a broadband microwave superconducting single photon detector

Viktor Lubsanov, Vladimir Gurtovoi, Alexander Semenov, Evgenii Glushkov, Vladimir Antonov, Oleg Astafiev

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, we develop and study superconducting materials for a broadband microwave single-photon detector for wide-range applications in superconducting quantum devices. Ideal materials of this type should have a superconducting gap of the order of 10 GHz (0.2 K), and possess a normal sheet resistance of the order of 50 Ω . We find that Ti/Pt bilayers are good candidates: it enables to vary the superconducting transition temperature in a wide range, from 0.1 to 0.4 K, and the sheet resistance in the range from 10 to 50 Ω . We present a proof-of-principle demonstration of a low-level microwave power detector based on a nanobridge made of a designed Ti/Pt bilayer. The response to the absorbed microwave power is consistent with the picture of the kinetic inductance detection in superconductors. The extracted response time corresponds to the recombination of quasiparticles with the emission of a photon to the microwave line.

Original languageEnglish
Article number105013
JournalSuperconductor Science and Technology
Volume35
Issue number10
DOIs
Publication statusPublished - Oct 2022

Keywords

  • microwaves
  • superconducting proximity effect
  • superconducting single photon detectors
  • thin films
  • titanium-platinum

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