Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam
The Josephson junction (JJ) is the corner stone of superconducting electronics and quantum information processing. While the technology for fabricating low Tc JJ is mature and delivers quantum circuits able to reach the “quantum supremacy”, the fabrication of reproducible and low-noise high-Tc JJ is...
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sg-ntu-dr.10356-1460942023-02-28T19:52:29Z Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam Couëdo, François Amari, Paul Feuillet-Palma, Cheryl Ulysse, Christian Srivastava, Yogesh Kumar Singh, Ranjan Bergeal, Nicolas Lesueur, Jérôme School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) The Photonics Institute Science::Physics Superconducting Devices Superconducting Properties and Materials The Josephson junction (JJ) is the corner stone of superconducting electronics and quantum information processing. While the technology for fabricating low Tc JJ is mature and delivers quantum circuits able to reach the “quantum supremacy”, the fabrication of reproducible and low-noise high-Tc JJ is still a challenge to be taken up. Here we report on noise properties at RF frequencies of recently introduced high-Tc Josephson nano-junctions fabricated by mean of a Helium ion beam focused at sub-nanometer scale on a YBa2Cu3O7 thin film. We show that their current-voltage characteristics follow the standard Resistively-Shunted-Junction (RSJ) circuit model, and that their characteristic frequency fc = (2e/h)IcRn reaches ~300 GHz at low temperature. Using the “detector response” method, we evidence that the Josephson oscillation linewidth is only limited by the thermal noise in the RSJ model for temperature ranging from T ~ 20 K to 75 K. At lower temperature and for the highest He irradiation dose, the shot noise contribution must also be taken into account when approaching the tunneling regime. We conclude that these Josephson nano-junctions present the lowest noise level possible, which makes them very promising for future applications in the microwave and terahertz regimes. Published version 2021-01-26T07:35:35Z 2021-01-26T07:35:35Z 2020 Journal Article Couëdo, F., Amari, P., Feuillet-Palma, C., Ulysse, C., Srivastava, Y. K., Singh, R., . . . Lesueur, J. (2020). Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam. Scientific Reports, 10(1), 10256-. doi:10.1038/s41598-020-66882-1 2045-2322 https://hdl.handle.net/10356/146094 10.1038/s41598-020-66882-1 32581302 2-s2.0-85087071448 1 10 en Scientific Reports © 2020 The Author(s). 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/. application/pdf |
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Science::Physics Superconducting Devices Superconducting Properties and Materials Couëdo, François Amari, Paul Feuillet-Palma, Cheryl Ulysse, Christian Srivastava, Yogesh Kumar Singh, Ranjan Bergeal, Nicolas Lesueur, Jérôme Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam |
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The Josephson junction (JJ) is the corner stone of superconducting electronics and quantum information processing. While the technology for fabricating low Tc JJ is mature and delivers quantum circuits able to reach the “quantum supremacy”, the fabrication of reproducible and low-noise high-Tc JJ is still a challenge to be taken up. Here we report on noise properties at RF frequencies of recently introduced high-Tc Josephson nano-junctions fabricated by mean of a Helium ion beam focused at sub-nanometer scale on a YBa2Cu3O7 thin film. We show that their current-voltage characteristics follow the standard Resistively-Shunted-Junction (RSJ) circuit model, and that their characteristic frequency fc = (2e/h)IcRn reaches ~300 GHz at low temperature. Using the “detector response” method, we evidence that the Josephson oscillation linewidth is only limited by the thermal noise in the RSJ model for temperature ranging from T ~ 20 K to 75 K. At lower temperature and for the highest He irradiation dose, the shot noise contribution must also be taken into account when approaching the tunneling regime. We conclude that these Josephson nano-junctions present the lowest noise level possible, which makes them very promising for future applications in the microwave and terahertz regimes. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Couëdo, François Amari, Paul Feuillet-Palma, Cheryl Ulysse, Christian Srivastava, Yogesh Kumar Singh, Ranjan Bergeal, Nicolas Lesueur, Jérôme |
format |
Article |
author |
Couëdo, François Amari, Paul Feuillet-Palma, Cheryl Ulysse, Christian Srivastava, Yogesh Kumar Singh, Ranjan Bergeal, Nicolas Lesueur, Jérôme |
author_sort |
Couëdo, François |
title |
Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam |
title_short |
Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam |
title_full |
Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam |
title_fullStr |
Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam |
title_full_unstemmed |
Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam |
title_sort |
dynamic properties of high-tc superconducting nano-junctions made with a focused helium ion beam |
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2021 |
url |
https://hdl.handle.net/10356/146094 |
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1759858296192237568 |