Bolometric detection of Josephson inductance in a highly resistive environment

Diego Subero (), Olivier Maillet, Dmitry S. Golubev, George Thomas, Joonas T. Peltonen, Bayan Karimi, Marco Marín-Suárez, Alfredo Levy Yeyati, Rafael Sánchez, Sunghun Park and Jukka P. Pekola
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Diego Subero: Aalto University School of Science
Olivier Maillet: Aalto University School of Science
Dmitry S. Golubev: Aalto University School of Science
George Thomas: Aalto University School of Science
Joonas T. Peltonen: Aalto University School of Science
Bayan Karimi: Aalto University School of Science
Marco Marín-Suárez: Aalto University School of Science
Alfredo Levy Yeyati: Universidad Autonoma de Madrid
Rafael Sánchez: Universidad Autonoma de Madrid
Sunghun Park: Universidad Autonoma de Madrid
Jukka P. Pekola: Aalto University School of Science

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract The Josephson junction is a building block of quantum circuits. Its behavior, well understood when treated as an isolated entity, is strongly affected by coupling to an electromagnetic environment. In 1983, Schmid predicted that a Josephson junction shunted by a resistance exceeding the resistance quantum RQ = h/4e2 ≈ 6.45 kΩ for Cooper pairs would become insulating since the phase fluctuations would destroy the coherent Josephson coupling. However, recent microwave measurements have questioned this interpretation. Here, we insert a small Josephson junction in a Johnson-Nyquist-type setup where it is driven by weak current noise arising from thermal fluctuations. Our heat probe minimally perturbs the junction’s equilibrium, shedding light on features not visible in charge transport. We find that the Josephson critical current completely vanishes in DC charge transport measurement, and the junction demonstrates Coulomb blockade in agreement with the theory. Surprisingly, thermal transport measurements show that the Josephson junction acts as an inductor at high frequencies, unambiguously demonstrating that a supercurrent survives despite the Coulomb blockade observed in DC measurements.

Date: 2023
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DOI: 10.1038/s41467-023-43668-3

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