Josephson tunnel junction controlled by quasiparticle injection

TL;DR

This paper proposes a Josephson tunnel junction transistor controlled by quasiparticle injection, enabling large supercurrent modulation and fast quenching, suitable for low-noise, low-power applications.

Contribution

It introduces a novel Josephson transistor design utilizing quasiparticle injection to control supercurrent, enhancing performance over traditional devices.

Findings

Large supercurrent enhancement achieved

Fast supercurrent quenching demonstrated

Potential for low-noise, low-power applications

Abstract

A Josephson tunnel junction transistor based on quasiparticle injection is proposed. Its operation relies on the manipulation of the electron distribution in one of the junction electrodes. This is accomplished by injecting quasiparticle current through the junction electrode by two additional tunnel coupled superconductors. Both large supercurrent enhancement and fast quenching can be achieved with respect to equilibrium by varying quasiparticle injection for proper temperature regimes and suitable superconductor combinations. Joined with large power gain this makes the device attractive for applications where reduced noise and low power dissipation are required.