Identification and control of electron-nuclear spin defects in diamond

TL;DR

This paper demonstrates a method to identify, locate, and control electron-nuclear spin defects near a nitrogen-vacancy center in diamond, enabling the creation of multi-spin quantum registers for quantum sensing and information processing.

Contribution

It introduces a novel spectroscopy-based approach to locate and manipulate multiple spin defects in diamond, advancing quantum device scalability.

Findings

Successfully identified and located two spin defects.

Controlled quantum states and created coherence among three electron spins.

Paved the way for multi-spin quantum register development.

Abstract

We experimentally demonstrate an approach to scale up quantum devices by harnessing spin defects in the environment of a quantum probe. We follow this approach to identify, locate, and control two electron-nuclear spin defects in the environment of a single nitrogen-vacancy center in diamond. By performing spectroscopy at various orientations of the magnetic field, we extract the unknown parameters of the hyperfine and dipolar interaction tensors, which we use to locate the two spin defects and design control sequences to initialize, manipulate, and readout their quantum state. We finally create quantum coherence among the three electron spins, paving the way for the creation of genuine tripartite entanglement. This approach will be useful to assemble multi-spin quantum registers for applications in quantum sensing and quantum information processing.