An Optimal Tunable Josephson Element for Quantum Computing

TL;DR

This paper presents a three-junction SQUID as an improved tunable element for Josephson quantum computing, offering enhanced coherence and error tolerance, validated through theoretical and experimental analysis.

Contribution

It introduces a novel three-junction SQUID device that outperforms traditional dc SQUIDs in quantum computing applications.

Findings

Good agreement between theory and experiment at 4.2 K

Enhanced coherence time and error tolerance demonstrated

Potential for improved quantum device performance

Abstract

We introduce a three-junction SQUID that can be effectively used as an optimal tunable element in Josephson quantum computing applications. This device can replace the simple dc SQUID generally used as tunable element in this kind of applications, with a series of advantages for the coherence time and for the tolerance to small errors. We study the device both theoretically and experimentally at 4.2 K, obtaining a good agreement between the results.