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arXiv · 2512.14909

High efficiency superconducting diode effect in a gate-tunable double-loop SQUID

Wyatt Gibbons·Teng Zhang·Kevin Barrow·Tyler Lindemann·Jukka I. Väyrynen·Michael J. Manfra
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Abstract

In superconducting quantum interference devices (SQUIDs), the superconducting diode effect may be generated by interference of multiple harmonic components in the current-phase relationships (CPRs) of different branches forming SQUID loops. Through the inclusion of two gate-tunable Josephson junctions in series in each interference branch of a double-loop SQUID, we demonstrate independent control over both the harmonic content and the amplitude of three interfering CPRs, facilitating significant improvement in the maximum diode efficiency. Through optimized gate-controlled tuning of individual Josephson energies, diode efficiency exceeding 50% is demonstrated. Flux-dependent oscillations show quantitative agreement with a simple model of SQUID operation.

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Wyatt Gibbons, Teng Zhang, Kevin Barrow, Tyler Lindemann, Jukka I. Väyrynen, Michael J. Manfra. 2025-12-16. High efficiency superconducting diode effect in a gate-tunable double-loop SQUID. https://doi.org/10.1103/2rtn-qkg9

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