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Bolometric detection of Josephson inductance in a highly resistive environment

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 q...

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Autores principales: Subero, Diego, Maillet, Olivier, Golubev, Dmitry S., Thomas, George, Peltonen, Joonas T., Karimi, Bayan, Marín-Suárez, Marco, Yeyati, Alfredo Levy, Sánchez, Rafael, Park, Sunghun, Pekola, Jukka P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10692220/
https://www.ncbi.nlm.nih.gov/pubmed/38040683
http://dx.doi.org/10.1038/s41467-023-43668-3
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author Subero, Diego
Maillet, Olivier
Golubev, Dmitry S.
Thomas, George
Peltonen, Joonas T.
Karimi, Bayan
Marín-Suárez, Marco
Yeyati, Alfredo Levy
Sánchez, Rafael
Park, Sunghun
Pekola, Jukka P.
author_facet Subero, Diego
Maillet, Olivier
Golubev, Dmitry S.
Thomas, George
Peltonen, Joonas T.
Karimi, Bayan
Marín-Suárez, Marco
Yeyati, Alfredo Levy
Sánchez, Rafael
Park, Sunghun
Pekola, Jukka P.
author_sort Subero, Diego
collection PubMed
description 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.
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spelling pubmed-106922202023-12-03 Bolometric detection of Josephson inductance in a highly resistive environment Subero, Diego Maillet, Olivier Golubev, Dmitry S. Thomas, George Peltonen, Joonas T. Karimi, Bayan Marín-Suárez, Marco Yeyati, Alfredo Levy Sánchez, Rafael Park, Sunghun Pekola, Jukka P. Nat Commun Article 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. Nature Publishing Group UK 2023-12-01 /pmc/articles/PMC10692220/ /pubmed/38040683 http://dx.doi.org/10.1038/s41467-023-43668-3 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Subero, Diego
Maillet, Olivier
Golubev, Dmitry S.
Thomas, George
Peltonen, Joonas T.
Karimi, Bayan
Marín-Suárez, Marco
Yeyati, Alfredo Levy
Sánchez, Rafael
Park, Sunghun
Pekola, Jukka P.
Bolometric detection of Josephson inductance in a highly resistive environment
title Bolometric detection of Josephson inductance in a highly resistive environment
title_full Bolometric detection of Josephson inductance in a highly resistive environment
title_fullStr Bolometric detection of Josephson inductance in a highly resistive environment
title_full_unstemmed Bolometric detection of Josephson inductance in a highly resistive environment
title_short Bolometric detection of Josephson inductance in a highly resistive environment
title_sort bolometric detection of josephson inductance in a highly resistive environment
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10692220/
https://www.ncbi.nlm.nih.gov/pubmed/38040683
http://dx.doi.org/10.1038/s41467-023-43668-3
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