Exponentially enhanced gravitationally induced entanglement between quantum systems with a two-phonon drive

TL;DR

This paper proposes a novel protocol using a two-phonon drive in a hybrid quantum system to significantly enhance and preserve gravitationally induced entanglement, aiding experimental detection of quantum gravity.

Contribution

It introduces a two-phonon drive strategy to amplify gravitational entanglement signals and improve robustness against dephasing in quantum gravity experiments.

Findings

Entanglement between test particle and qubit is significantly enhanced.

Entanglement generation rate is increased compared to no drive.

Partial preservation of entanglement under dephasing conditions.

Abstract

Finding a feasible protocol for probing the quantum nature of gravity has been attracting an increasing amount of attention. In this manuscript, we propose a protocol to enhance the detection of gravitationally induced entanglement by exploiting the two-phonon drive in a hybrid quantum setup. We consider the setup consisting of a test particle in a double-well potential, a qubit and a quantum mediator. There is gravitational interaction between the test particle and the mediator, and a spin-phonon coupling between the mediator and the qubit. By introducing a two-phonon drive, the entanglement between the TP and the qubit are significantly enhanced and the entanglement generation rate is remarkably increased compared with the case without the two-phonon drive. Moreover, the entanglement between the TP and the qubit can be partially preserved in the presence of dephasing by the proposed strategy. This work would open a different avenue for experimental detection of the quantum nature of gravity, which could find applications in quantum information science.