Optically induced static magnetic field in ensemble of nitrogen-vacancy centers in diamond

TL;DR

This paper demonstrates a novel method to generate a local static magnetic field at the nanoscale using photonic spin density in nitrogen-vacancy centers in diamond, enabling all-optical control of spin qubits.

Contribution

It introduces a new technique for optically inducing static magnetic fields in NV centers, facilitating coherent spin control without magnetic coils.

Findings

Achieved spin rotation exceeding 10 degrees via optical means.

Demonstrated effective static magnetic field generation through PSD.

Potential for all-optical quantum information processing.

Abstract

Generation of local magnetic field at the nanoscale is desired for many applications such as spin-qubit-based quantum memories. However, this is a challenge due to the slow decay of static magnetic fields. Here, we demonstrate photonic spin density (PSD) induced effective static magnetic field for an ensemble of nitrogen-vacancy (NV) centers in bulk diamond. This locally induced magnetic field is a result of coherent interaction between the optical excitation and the NV centers. We demonstrate an optically induced spin rotation on the Bloch sphere exceeding 10 degrees which has potential applications in all optical coherent control of spin qubits.