Bolometric detection of Josephson inductance in a highly resistive environment
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-12
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en
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8
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Nature Communications, Volume 14, issue 1, pp. 1-8
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 R Q = h/4e 2 ≈ 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.Description
Funding Information: We thank P. Joyez, C. Altimiras, T. Yamamoto, J. Ankerhold, and J. Stockburger for illuminating discussions. We thank funding from Academy of Finland grant 336810, the Spanish State Research Agency through Grant RYC-2016-20778, and the EU for FET-Open contract AndQC. D.S. and J.P.P. acknowledge the support from the innovation program under the European Research Council (ERC) program (grant agreement 742559). This research was achieved using Otaniemi Research Infrastructure for Micro and Nanotechnologies (OtaNano). | openaire: EC/H2020/742559/EU//SQH
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Subero, D, Maillet, O, Golubev, D S, Thomas, G, Peltonen, J T, Karimi, B, Marín-Suárez, M, Yeyati, A L, Sánchez, R, Park, S & Pekola, J P 2023, ' Bolometric detection of Josephson inductance in a highly resistive environment ', Nature Communications, vol. 14, no. 1, 7924, pp. 1-8 . https://doi.org/10.1038/s41467-023-43668-3