Lasing in circuit quantum electrodynamics with strong noise

TL;DR

This paper investigates how different types of electromagnetic environments affect lasing behavior in circuit quantum electrodynamics systems, revealing that environmental spectral properties significantly influence photon production and resonance features.

Contribution

It introduces a detailed analysis of the impact of various environmental spectral functions on lasing in superconducting quantum circuits, highlighting environmental effects on photon number and resonance structure.

Findings

Environmental spectral functions significantly influence photon creation.

Resonance peaks are broadened by environmental effects.

Additional resonances can emerge due to environment structure.

Abstract

We study a model which can describe a superconducting single electron transistor (SSET) or a double quantum dot coupled to transmission-line oscillator. In both cases the degree of freedom is given by a charged particle, which couples strongly to the electromagnetic environment or phonons. We consider the case where a lasing condition is established and study the dependence of the average photon number in the resonator on the spectral function of the electromagnetic environment. We focus on three important cases: a strongly coupled environment with a small cut-off frequency, a structured environment peaked at a specific frequency and 1/f-noise. We find that the electromagnetic environment can have a substantial impact on the photon creation. Resonance peaks are in general broadened and additional resonances can appear.