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BAQIS Quantum Science Forum 167: Towards Ideal Supercurrent electronics in Josephson Junctions
2026/01/26
Date and Time: 26-January-2026 2pm (Beijing time)
Speaker: Rubén Seoane, Institute of Materials Sciences of Madrid - Spanish Research Council, Spain
Host: Hongqi Xu ( BAQIS)
Title: Towards Ideal Supercurrent electronics in Josephson Junctions
About the Speaker:
Rubén Seoane is a condensed-matter theorist working at the interface between nanoscience and superconductivity, with a focus on quantum devices for next-generation quantum technologies. His research has explored correlated phenomena in nanoscale systems, the physics of Andreev and Majorana bound states, and the design of robust qubit architectures and non-dissipative superconducting electronics. He did his PhD at the Autonomous University of Madrid (Spain), under the supervision of Prof. Alfredo Levy-Yeyati. In 2018, he moved as a postdoc to Lund University (Sweden) under the supervision of Prof. Martin Leijnse, being also external researcher at the Niels Bohr Institute (University of Copenhagen, Denmark). Since 2023, Rubén is a group leader at the Materials Science Institute of Madrid, belonging to the Spanish Research Council (ICMM-CSIC).
Abstract:
Non-reciprocal elements are essential components in modern electronics, that enable functionalities such as current rectification, power conversion, and signal detection. The simplest example is the semiconductor diode, which permits current flow in one direction while blocking it in the other direction, depending on the polarity of the applied voltage bias. Motivated by the pursuit of energy-efficient electronic components, recent efforts have focused on realizing a superconducting analogue: the Josephson diode, which exhibits an asymmetric critical current, enabling non-dissipative supercurrent flow only in one direction [1].Although the Josephson diode effect has been demonstrated in several materials and platforms, the rectification ratio (so-called diode efficiency) is often modest, typically reaching a few percent of the critical current. In this presentation, I will discuss recent progress toward ideal superconducting diodes, where dissipationless current is allowed in only one direction. I will focus on driven Josephson junctions [2,3], which have enabled experimental realizations of ideal diodes in both SQUIDs [4] and single junction devices [5,6]. This progress paves the way toward practical supercurrent rectifiers, with promising applications in low-dissipation superconducting circuits and efficient information processing.
References:
[1] M. Nadeem, M. S. Fuhrer, and X. Wang arXiv.2301.13564 (2023).
[2] R. Seoane Souto, M. Leijnse, C. Schrade, M. Valentini, G. Katsaros, and J. Danon, Phys. Rev. Research 6, L022002 (2024).
[3] D. Scheer, R. Seoane Souto, F. Hassler, and J. Danon New J. Phys. 27 033013 (2025).
[4] M. Valentini et al., Nat. Commun. 15, 169 (2024).
[5] H. Su et al., J.-Y. Wang, H. Gao, Y. Luo, S. Yan, X. Wu, G. Li, J. Shen, L. Lu, J. Zhao, P. Zhang, and H. Xu, Phys. Rev. Lett. 133, 087001 (2024)
[6] L Borgongino, R Seoane Souto, A Paghi, G Senesi, K Skibinska, L Sorba, Riccardi, F. Giazotto, E. Strambini, Nano Letters 25, 14451 (2025)