Topical Review: Spins and mechanics in diamond

TL;DR

This review discusses recent advances in diamond-based hybrid quantum devices that couple nitrogen-vacancy centers with mechanical oscillators, highlighting their potential for quantum information processing and sensing.

Contribution

It provides a comprehensive overview of experimental progress, potential applications, and future challenges in diamond spin-mechanics hybrid systems.

Findings

Demonstrated coupling between NV centers and mechanical oscillators

Identified pathways toward strong spin-phonon coupling

Outlined potential quantum applications like phonon cooling and spin interactions

Abstract

There has been rapidly growing interest in hybrid quantum devices involving a solid-state spin and a macroscopic mechanical oscillator. Such hybrid devices create exciting opportunities to mediate interactions between disparate qubits and to explore the quantum regime of macroscopic mechanical objects. In particular, a system consisting of the nitrogen-vacancy defect center in diamond coupled to a high quality factor mechanical oscillator is an appealing candidate for such a hybrid quantum device, as it utilizes the highly coherent and versatile spin properties of the defect center. In this paper, we will review recent experimental progress on diamond-based hybrid quantum devices in which the spin and orbital dynamics of single defects are driven by the motion of a mechanical oscillator. In addition, we discuss prospective applications for this device, including long range, phonon-mediated spin-spin interactions, and phonon cooling in the quantum regime. We conclude the review by evaluating the experimental limitations of current devices and identifying alternative device architectures that may reach the strong coupling regime.