Theory of the photonic Joule effect in superconducting circuits

TL;DR

This paper theoretically demonstrates that in superconducting circuits, photonic baths can become overheated due to the photonic Joule effect, significantly affecting the system's steady state and current-voltage characteristics.

Contribution

It introduces the concept of the photonic Joule effect in superconducting circuits and analyzes how photonic baths can be overheated, altering system behavior.

Findings

Photonic baths can reach non-equilibrium overheated states.

Overheating significantly impacts the current-voltage curve.

The effect is analogous to Joule heating in electrical conductors.

Abstract

When a small system is coupled to a bath, it is generally assumed that the state of the bath remains unaffected by the system due to the bath's large number of degrees of freedom. Here we show theoretically that this assumption can be easily violated for photonic baths typically used in experiments involving superconducting circuits. We analyze the dynamics of a voltage-biased Josephson junction coupled to a photonic bath, represented as a long Josephson junction chain. Our findings show that the system can reach a non-equilibrium steady state where the photonic degrees of freedom become significantly overheated, leading to a qualitative change in the current-voltage $I-V$ curve. This phenomenon is analogous to the Joule effect observed in electrical conductors, where flowing current can substantially heat up electrons. Recognizing this effect is crucial for the many applications of high-impedance environments in quantum technologies.