Ground-State Cooling of a Mechanical Oscillator via a Hybrid Electro-Optomechanical System

TL;DR

This paper proposes a hybrid electro-optomechanical system for ground-state cooling of a mechanical oscillator, combining qubit and cavity interactions, and demonstrates its superior cooling efficiency over individual methods.

Contribution

It introduces a systematic derivation of the hybrid system Hamiltonian and compares cooling regimes, showing enhanced effectiveness of hybrid cooling in various regimes.

Findings

Hybrid cooling outperforms individual cooling methods.

Effective in both resolved and unresolved sideband regimes.

Systematic derivation of the hybrid system Hamiltonian.

Abstract

We present a scheme for ground-state cooling of a mechanical resonator by simultaneously coupling it to a superconducting qubit and a cavity field. The Hamiltonian describing the hybrid system dynamics is systematically derived. The cooling process is driven by a red-detuned ac drive on the qubit and a laser drive on the optomechanical cavity. We have investigated cooling in the weak and the strong coupling regimes for both the individual system, i.e., qubit assisted cooling and optomechanical cooling, and compared them with the effective hybrid cooling. It is shown that hybrid cooling is more effective compared to the individual cooling mechanisms, and could be applied in both the resolved and the unresolved sideband regimes.