Electromagnetically-induced transparency with amplification in superconducting circuits

TL;DR

This paper demonstrates that superconducting circuits can exhibit electromagnetically-induced transparency alongside amplification, revealing a novel frequency domain structure with potential applications in quantum information processing.

Contribution

The study introduces a fluxonium superconducting circuit that achieves simultaneous electromagnetically-induced transparency and lasing without inversion, a novel combination in microwave quantum optics.

Findings

EIT and amplification coexist in superconducting circuits.

The transparency window is flanked by absorption and amplification.

The fluxonium circuit's energy structure enables this phenomenon.

Abstract

We show that electromagnetically-induced transparency and lasing without inversion are simultaneously achieved for microwave fields by using a fluxonium superconducting circuit. As a result of the $\Delta$ energy-level structure of this artificial three-level atom, we find the surprising phenomenon that the electromagnetically-induced transparency window in the frequency domain is sandwiched between absorption on one side and amplification on the other side.