Strong Coupling Optomechanics Mediated by a Qubit in the Dispersive Regime

TL;DR

This paper investigates how a qubit mediates strong coupling between mechanical and electromagnetic modes in cavity optomechanics, enabling enhanced nonlinear dynamics and quantum control at the single-photon level.

Contribution

It provides a detailed analysis of qubit-mediated strong coupling in a hybrid system using Schrieffer-Wolff approximation, expanding the understanding of nonlinear quantum interactions.

Findings

Identification of regimes for effective strong coupling

Demonstration of enhanced single-photon optomechanical interactions

Potential for improved quantum control and sensing

Abstract

Cavity optomechanics represents a flexible platform for the implementation of quantum technologies, useful in particular for the realization of quantum interfaces, quantum sensors and quantum information processing. However, the dispersive, radiation-pressure interaction between the mechanical and the electromagnetic modes is typically very weak, harnessing up to now the demonstration of interesting nonlinear dynamics and quantum control at the single photon level. It has already been shown both theoretically and experimentally that if the interaction is mediated by a Josephson circuit, one can have an effective dynamic corresponding to a huge enhancement of the single-photon optomechanical coupling. Here we analyze in detail this phenomenon in the general case when the cavity mode and the mechanical mode interact via an off-resonant qubit. Using a Schrieffer-Wolff approximation treatment, we determine the regime where this tripartite hybrid system behaves as an effective cavity optomechanical system in the strong coupling regime