Quantum bits with Josephson junctions

TL;DR

This paper reviews the development of superconducting quantum circuits with Josephson junctions, highlighting their applications in quantum optics and quantum information processing, and explaining their fundamental principles and potential for future research.

Contribution

It provides an overview of the recent advancements and new applications of Josephson junctions in quantum optics and quantum information, emphasizing their role in superconducting quantum circuits.

Findings

Superconducting circuits with Josephson junctions enable quantum information processing.

These systems open new avenues for quantum optics and atomic physics research.

The chapter explains fundamental principles and recent developments in the field.

Abstract

Already in the first edition of this book (Barone and Paterno, "Fundamentals and Physics and Applications of the Josephson Effect", Wiley 1982), a great number of interesting and important applications for Josephson junctions were discussed. In the decades that have passed since then, several new applications have emerged. This chapter treats one such new class of applications: quantum optics and quantum information processing (QIP) based on superconducting circuits with Josephson junctions. In this chapter, we aim to explain the basics of superconducting quantum circuits with Josephson junctions and demonstrate how these systems open up new prospects, both for QIP and for the study of quantum optics and atomic physics.