Bolometric detection of Josephson inductance in a highly resistive environment
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 res...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-12-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-43668-3 |
| _version_ | 1827603246283227136 |
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| author | Diego Subero Olivier Maillet Dmitry S. Golubev George Thomas Joonas T. Peltonen Bayan Karimi Marco Marín-Suárez Alfredo Levy Yeyati Rafael Sánchez Sunghun Park Jukka P. Pekola |
| author_facet | Diego Subero Olivier Maillet Dmitry S. Golubev George Thomas Joonas T. Peltonen Bayan Karimi Marco Marín-Suárez Alfredo Levy Yeyati Rafael Sánchez Sunghun Park Jukka P. Pekola |
| author_sort | Diego Subero |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T05:35:18Z |
| format | Article |
| id | doaj.art-24959b50408745c0a2d9d18bc2aa3e36 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-09T05:35:18Z |
| publishDate | 2023-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-24959b50408745c0a2d9d18bc2aa3e362023-12-03T12:29:10ZengNature PortfolioNature Communications2041-17232023-12-011411810.1038/s41467-023-43668-3Bolometric detection of Josephson inductance in a highly resistive environmentDiego Subero0Olivier Maillet1Dmitry S. Golubev2George Thomas3Joonas T. Peltonen4Bayan Karimi5Marco Marín-Suárez6Alfredo Levy Yeyati7Rafael Sánchez8Sunghun Park9Jukka P. Pekola10PICO Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University School of SciencePICO Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University School of SciencePICO Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University School of SciencePICO Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University School of SciencePICO Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University School of SciencePICO Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University School of SciencePICO Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University School of ScienceDepartamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autonoma de MadridDepartamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autonoma de MadridDepartamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autonoma de MadridPICO Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University School of ScienceAbstract 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.https://doi.org/10.1038/s41467-023-43668-3 |
| spellingShingle | Diego Subero Olivier Maillet Dmitry S. Golubev George Thomas Joonas T. Peltonen Bayan Karimi Marco Marín-Suárez Alfredo Levy Yeyati Rafael Sánchez Sunghun Park Jukka P. Pekola Bolometric detection of Josephson inductance in a highly resistive environment Nature Communications |
| 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 |
| url | https://doi.org/10.1038/s41467-023-43668-3 |
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