Scalable nuclear-spin entanglement mediated by a mechanical oscillator

TL;DR

This paper introduces a scalable solid-state hybrid system using NV centers and a mechanical oscillator to induce long-range nuclear spin interactions, enabling multipartite entanglement for quantum computing.

Contribution

It presents a novel hybrid platform that mediates nuclear spin entanglement via a mechanical oscillator, relaxing spatial constraints and maintaining coherence.

Findings

Effective long-range nuclear spin interactions achieved

Multipartite entanglement among nuclear spins demonstrated

Potential for scalable quantum computing applications

Abstract

We propose a solid-state hybrid platform based on an array of implanted nitrogen-vacancy (NV) centers in diamond magnetically coupled to a mechanical oscillator. The mechanical oscillator and the NV electronic spins both act as a quantum bus and allow us to induce an effective long-range interaction between distant nuclear spins, relaxing the requirements on their spatial distance. The coherent nuclear spin-spin interaction, having the form of an Ising model, can be maintained in the presence of mechanical damping and spin dephasing via a pulsed dynamical decoupling of the nuclear spins in addition to the microwave driving field of the electronic spins. The present hybrid platform provides a scalable way to prepare multipartite entanglement among nuclear spins with long coherence times and can be applied to generate graph states that may be used for universal quantum computing.