Supercurrent switching in Three- and Four- Terminal Josephson Junctions

TL;DR

This paper investigates supercurrent switching in 3- and 4-terminal Josephson junctions, revealing that weak gate coupling results in similar current-gate relations and abrupt supercurrent switches at low temperatures.

Contribution

It demonstrates that weakly coupled gates produce comparable supercurrent behaviors in both junction geometries, highlighting the nature of supercurrent switching.

Findings

Supercurrent switches abruptly at low temperature

Current-gate relation is similar for 3- and 4-terminal junctions

Switching behavior depends on gate voltage and current

Abstract

Control of the Josephson current by varying a gate current has recently been demonstrated in both 4-terminal and 3-terminal junctions. We show that, when the the gates are weakly coupled to the Josephson junction, the Josephson current versus gate current (or versus gate voltage) relation is the same for both the 4- and 3- terminal geometries. At low temperature, the supercurrent switches abruptly as a function of the gate voltage, but only slowly as a function of the gate current.