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  • Letter

Electron-phonon interactions in the Andreev bound states of aluminum nanobridge Josephson junctions

James T. Farmer*, Azarin Zarassi, Sadman Shanto, Darian Hartsell†, and Eli M. Levenson-Falk‡

  • Department of Physics, and Center for Quantum Information Science and Technology, University of Southern California, Los Angeles, California 90089-0484, USA

  • *jtfarmer@usc.edu
  • †Present address: Georgia Tech Research Institute, Atlanta, Georgia 30332, USA.
  • ‡elevenso@usc.edu
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Phys. Rev. B 107, L140506 – Published 27 April, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L140506

Abstract

We report continuous measurements of quasiparticles trapping and clearing from Andreev bound states in aluminum nanobridge Josephson junctions integrated into a superconducting-qubit-like device. We find that trapping is well modeled by independent spontaneous emission events. Above 80 mK the clearing process is well described by the absorption of thermal phonons, but other temperature-independent mechanisms dominate at low temperature. We find a complex structure in the dependence of the low-temperature clearing rate on the Andreev bound state energy. Our results shed light on quasiparticle behavior in qubitlike circuits.

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Phys. Rev. B 107, L140506– Published 27 April, 2023
  • Received 30 November 2022
  • Revised 21 March 2023
  • Accepted 5 April 2023
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