Electrodynamics of a split-ring Josephson resonator in a microwave line

TL;DR

This paper studies how a split-ring Josephson resonator interacts with microwaves, showing it has multiple steady states that can be switched with pulses, and analyzing their spectral properties and controllability.

Contribution

It introduces the analysis of a split-ring Josephson resonator's steady states, spectral lines, and controllability using external microwave pulses and magnetic fields.

Findings

Multiple steady states exist in the device.

Spectral lines are of the Fano type.

External magnetic fields can shift spectral lines.

Abstract

We consider the coupling of an electromagnetic wave to a split-ring Josephson oscillator or radio-frequency SQUID in the hysteretic regime. This device is similar to an atomic system in that it has a number of steady states. We show that one can switch between these with a suitable short external microwave pulse. The steady states can be characterized by their resonant lines which are of the Fano type. Using a static magnetic field, we can shift these spectral lines and lift their degeneracy.