Coherent phonon dynamics in spatially separated graphene mechanical resonators

TL;DR

This paper demonstrates tunable coherent phonon dynamics in a series of graphene mechanical resonators, showing Rabi oscillations and Ramsey interference, which enable information transfer and storage between spatially separated vibrational modes.

Contribution

It introduces a novel architecture of three coupled graphene resonators with electrical control, enabling coherent phonon interactions over distance, advancing phonon-based quantum information processing.

Findings

Observation of Rabi oscillations between separated resonators

Detection of Ramsey interference indicating indirect coupling

Control of phonon dynamics via electrical signals

Abstract

Vibrational modes in mechanical resonators provide a promising candidate to interface and manipulate classical and quantum information. The observation of coherent dynamics between distant mechanical resonators can be a key step towards scalable phonon-based applications. Here we report tunable coherent phonon dynamics with an architecture comprising three graphene mechanical resonators coupled in series, where all resonators can be manipulated by electrical signals on control gates. We demonstrate coherent Rabi oscillations between spatially separated resonators indirectly coupled via an intermediate resonator serving as a phonon cavity. The Rabi frequency fits well with the microwave burst power on the control gate. We also observe Ramsey interference, where the oscillation frequency corresponds to the indirect coupling strength between these resonators. Such coherent processes indicate that information encoded in vibrational modes can be transferred and stored between spatially separated resonators, which can open the venue of on-demand phonon-based information processing.