Nonlinear Quantum Optomechanics via Individual Intrinsic Two-Level Defects

TL;DR

This paper explores the use of intrinsic two-level defects in optomechanical devices to achieve strong coupling and quantum control of mechanical phonons, enabling phenomena like phonon blockade and non-classical state preparation.

Contribution

It introduces a method to utilize natural two-level defect states for cavity QED-like interactions with phonons in optomechanical systems, demonstrating potential for quantum control.

Findings

Strong coupling regime achievable with existing nano-optomechanical systems

Signatures of quantum interactions persist at finite temperature

Deterministic preparation of non-classical mechanical states possible

Abstract

We propose to use the intrinsic two-level system (TLS) defect states found naturally in integrated optomechanical devices for exploring cavity QED-like phenomena with localized phonons. The Jaynes-Cummings-type interaction between TLS and mechanics can reach the strong coupling regime for existing nano-optomechanical systems, observable via clear signatures in the optomechanical output spectrum. These signatures persist even at finite temperature, and we derive an explicit expression for the temperature at which they vanish. Further, the ability to drive the defect with a microwave field allows for realization of phonon blockade, and the available controls are sufficient to deterministically prepare non-classical states of the mechanical resonator.