New signatures of the dynamical Casimir effect in a superconducting circuit

TL;DR

This paper predicts new experimental signatures of the dynamical Casimir effect in superconducting circuits, including altered spectral distributions and significant enhancements in particle creation, guiding future experimental efforts.

Contribution

It introduces specific modifications to existing experiments that reveal distinctive spectral and quantitative signatures of the dynamical Casimir effect in superconducting circuits.

Findings

Different spectral distribution for created particles.

Approximately 5000-fold increase in particle number.

Approximately 300-fold increase in particle creation rate.

Abstract

We found new signatures of the dynamical Casimir effect (DCE) in the context of superconducting circuits. We show that if the recent experiment made by Wilson {\it et al}, which brought the DCE into reality for the first time, is repeated with slight modifications (for instance, different values for the capacitance of the SQUID), three remarkable results will show up, namely: {\it (i)} a quite different spectral distribution for the created particles, deviating from the typical parabolic shape; {\it (ii)} an enhancement by a factor of approximately $5 \times 10^3 $ in the number of created particles with half driven frequency of the effective moving mirror and {\it (iii)} an enhancement by a factor of $3 \times 10^2$ in the particle creation rate. These results may guide the experimentalists in their search for alternative routes to observe the DCE in future experiments.