# Mechanical qubit-light entanglers in hybrid nonlinear qubit-optomechanics

## TL;DR

This paper introduces a hybrid nonlinear approach to entangle matter qubits with light using mechanical oscillators, enabling nonclassical state preparation without mechanical cooling or frequency tuning.

## Contribution

It demonstrates a novel method for qubit-light entanglement via parametric and radiation pressure couplings, avoiding the need for mechanical cooling or frequency adjustments.

## Key findings

- Maximal qubit-light entanglement achieved at optimal times.
- Conditional nonclassical optical states can be prepared in weak coupling regimes.
- Nonclassical states can be generated in moderate-to-strong coupling regimes.

## Abstract

Interfacing between matter qubits and light is a crucial provision for numerous quantum technological applications. However, a generic qubit may not directly interact with a relevant optical field mode, and hence, one could necessitate to adjust frequencies to match resonance conditions between parties. In this work, we show how a parametric coupling of the qubit with a mechanical oscillator, in conjunction with the trilinear radiation pressure coupling of the same object with light, can induce maximal qubit-light entanglement at an optimal time. We also show how our method enables conditional nonclassical state preparation of an optical field state via qubit measurements in the weak optomechanical coupling regime, whereas nonclassical states of the same can dynamically be achieved in the moderate-to-strong single photon coupling limit. Our scheme benefits from not requiring any cooling of the mechanical component, and not needing an adjusting of the detunings and transition frequencies to have resonance between any pairs of quantum systems.