Manipulating counter-rotating interactions in the quantum Rabi model via qubit frequency modulation

TL;DR

This paper introduces a method to control counter-rotating interactions in the quantum Rabi model through qubit frequency modulation, enabling manipulation of photon emission in superconducting circuits.

Contribution

It presents a practical modulation technique to enhance or suppress counter-rotating interactions across different coupling regimes in the quantum Rabi model.

Findings

Enhanced photon emission from cavity vacuum observed in the Jaynes-Cummings regime.

Control of CR interactions achieved via frequency modulation in superconducting circuits.

Applicable to both weak and ultrastrong coupling regimes.

Abstract

We propose a practical approach to manipulate the counter-rotating (CR) interactions in the quantum Rabi model by introducing a sinusoidal modulation to the transition frequency of the quantum two-level system in this model. By choosing appropriate modulation frequency and amplitude, enhancement and suppression of the CR interactions can be achieved in the Jaynes-Cummings regime (including both weak- and strong-coupling cases) as well as the ultrastrong-coupling regime. In particular, we calculate the output photon emission of the cavity vacuum state under enhanced CR terms. Our results show that continuous and steady photon emission from the cavity vacuum can be observed in the Jaynes-Cummings regime as a consequence of this enhancement. Our approach can be realized in superconducting quantum circuits.