Tunable Electromagnetically Induced Transparency and Absorption with Dressed Superconducting Qubits

TL;DR

This paper proposes a method to achieve tunable electromagnetically induced transparency and absorption in superconducting qubits by controlling their level-spacing, leveraging dressed relaxation and dephasing rates, with potential for experimental realization.

Contribution

It introduces a novel approach to tune EIT and EIA in superconducting qubits via dressed state manipulation, supported by recent experimental data.

Findings

EIT and EIA can be tuned by adjusting the qubit level-spacing.

Dressed relaxation and dephasing rates influence the transition properties.

Experimental data supports the feasibility of the proposed method.

Abstract

Electromagnetically induced transparency and absorption (EIT and EIA) are usually demonstrated by three-level atomic or atom-like systems. In contrast to the usual case, we theoretically study the EIT and EIA in an equivalent three-level system, which is constructed by dressing a superconducting two-level system (qubit) dressed by a single-mode cavity field. In this equivalent system, we find that both the EIT and the EIA can be tuned by controlling the level-spacing of the superconducting qubit and hence controlling the dressed system. This tunability is due to the dressed relaxation and dephasing rates which vary parametrically with the level-spacing of the original qubit and thus affect the transition properties of the dressed qubit and the susceptibility. These dressed relaxation and dephasing rates characterize the reaction of the dressed qubit to an incident probe field. We also use recent experimental data on superconducting qubits (charge, phase, and flux qubits) to demonstrate our approach and show the possibility of experimentally realizing this proposal.