Superconducting diode from flux biased Josephson junction arrays

TL;DR

This paper demonstrates a practical way to create a superconducting diode effect using standard Josephson junctions and flux bias lines, eliminating the need for exotic materials or non-sinusoidal junction properties.

Contribution

It introduces a method to realize the superconducting diode effect in flux biased Josephson junction arrays with standard components, simplifying experimental implementation.

Findings

Superconducting diode effect can be achieved without exotic materials.

The method uses only standard sinusoidal Josephson junctions and flux bias lines.

The approach is compatible with scalable silicon-chip superconducting technology.

Abstract

We propose a realization of the superconducting diode effect in flux biased superconducting circuits of Josephson junctions. So far the observation of the superconducting diode effect has been limited to rather exotic material platforms. In theoretical proposals, it relied on a non-sinusoidal form of the current phase relation of Josephson junctions. Here, we show how the diode effect can be engineered in superconducting circuits without any such requirements. The only necessary ingredients are standard sinusoidal Josephson junctions and flux bias lines that are readily available in scalable industrial silicon-chip based superconducting design processes.