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

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.