Superconducting SET with tunable electromagnetic environment

TL;DR

This paper investigates how tunable electromagnetic environments, created by SQUID arrays, influence the Coulomb blockade and charge periodicity in superconducting single-electron transistors, demonstrating potential for on-chip noise filtering.

Contribution

It introduces a method to control the electromagnetic environment of S-SETs using SQUID arrays with adjustable impedance, revealing effects on Coulomb blockade and charge periodicity.

Findings

Increased array resistance sharpens Coulomb blockade

Transition from e- to 2e-periodic gate dependence observed

SQUID arrays serve as effective on-chip noise filters

Abstract

We have studied the environmental effect on superconducting single-electron transistors (S-SETs) by biasing S-SETs with arrays of small-capacitance dc SQUIDs, whose effective impedance can be varied in situ. As the zero-bias resistance of the arrays is increased, Coulomb blockade in the S-SET becomes sharper, and the gate-voltage dependence changes from e-periodic to 2e-periodic. The SQUID arrays could be used as on-chip noise filters.