Hybrid quantum device with nitrogen-vacancy centers in diamond coupled to carbon nanotubes

TL;DR

This paper proposes a hybrid quantum device combining nitrogen-vacancy centers in diamond with carbon nanotubes, enabling tunable magnetomechanical interactions for quantum information applications.

Contribution

It introduces a novel spin-nanomechanical system with strong, tunable couplings between NV centers and nanotube vibrations, advancing hybrid quantum device design.

Findings

Demonstrated tunable magnetomechanical coupling

Engineered strong interactions between NV spins and nanotube vibrations

Potential for phonon-mediated quantum information processing

Abstract

We show that nitrogen-vacancy (NV) centers in diamond interfaced with a suspended carbon nanotube carrying a dc current can facilitate a spin-nanomechanical hybrid device. We demonstrate that strong magnetomechanical interactions between a single NV spin and the vibrational mode of the suspended nanotube can be engineered and dynamically tuned by external control over the system parameters. This spin-nanomechanical setup with strong, \emph{intrinsic} and \emph{tunable} magnetomechanical couplings allows for the construction of hybrid quantum devices with NV centers and carbon-based nanostructures, as well as phonon-mediated quantum information processing with spin qubits.