Josephson junctions, superconducting circuits, and qubit for quantum technologies

TL;DR

This paper reviews the fundamental principles and applications of Josephson junctions and superconducting circuits, highlighting their significance in quantum technologies, metrology, and nanotechnology, with a focus on their properties and practical implementations.

Contribution

It provides a comprehensive overview of Josephson junctions, emphasizing their role in advancing superconducting qubits and quantum devices, and discusses recent technological developments.

Findings

Josephson junctions enable high-speed, low-dissipation superconducting circuits.

JJs are crucial for developing superconducting qubits in quantum computing.

Applications span metrology, radiation detection, and nanotechnology.

Abstract

In the realm of physics, a pivotal moment occurred six decades ago when Brian Josephson made a groundbreaking prediction, setting in motion a series of events that would eventually earn him the prestigious Nobel Prize eleven years later. This prediction centered around what is now known as the Josephson effect, a phenomenon with far-reaching implications. At the heart of this effect lies the Josephson junction (JJ), a device that has become a linchpin in various scientific applications. This chapter delves into the foundational principles of the Josephson effect and the remarkable properties of JJs. From their role in metrology to their application in radiation detectors, these junctions have ushered in a new era of electronics. Exploiting the unique features of superconductive devices, such as high speed, low dissipation, and dispersion, JJs find today practical implementation in the development of superconductive qubits and nanotechnology applications.