[8a-A24-1~13] 11.1 Fundamental properties

12:00 PM - 12:15 PM JST(3:00 AM - 3:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[8a-A24-12] Detection of quantum radiation associated with the Andreev reflection process in superconducting-normal metal junction

〇(M2)Shota Nagamoto¹, Shioda Yuta¹, Hosaka Yuta¹, Mizugaki Yoshinao¹, Shimada Hiroshi¹ (1.UEC)

Keywords:

Superconductivity,Quantum computer

In connection with the sources of non-equilibrium quasiparticles—a problem in superconducting quantum computers and other systems—we focused on superconducting-to-normal-metal junctions (SN junctions), which are present in many superconducting circuits, and measured quantum radiation from the junctions associated with quasiparticle recombination while varying the junction bias. As a result, in the voltage region where Andreev reflection—previously thought not to involve quantum radiation—occurs, we detected quantum radiation starting at a voltage equivalent to one-third of the effective superconducting gap of the S electrode, which had been reduced by the inverse proximity effect.