# Josephson junction cavity systems as cousins of the quantum optical micromaser

## TL;DR

This paper compares Josephson-photonics devices with the quantum optical micromaser, highlighting their similarities and differences in modeling open quantum systems and photon generation in superconducting circuits.

## Contribution

It provides a theoretical analysis linking Josephson-photonics systems to the well-studied micromaser model, offering insights into their dynamics and potential applications.

## Key findings

- Josephson-photonics devices can be modeled similarly to micromasers.
- Differences in charge transport and photon production mechanisms are identified.
- The study enhances understanding of open quantum system dynamics in superconducting circuits.

## Abstract

We explore the similarities and differences between simple theoretical models developed to describe the quantum optical micromaser and Josephson-photonics devices. Whilst the micromaser has long been recognised as an important model for the dynamics of open quantum systems far from equilibrium, so-called Josephson-photonics devices are a recently developed form of superconducting quantum circuit in which the quantum transport of charges through a voltage-biased Josephson junction drives the production of photons in a microwave resonator.