Dark State Polarizing a Nuclear Spin in the Vicinity of a Nitrogen-Vacancy Center

TL;DR

This paper proposes a robust method to polarize nearby nuclear spins of an NV center using a dark state, enhancing quantum information applications by overcoming sensitivity issues of previous schemes.

Contribution

It introduces a theoretical approach for nuclear spin polarization via dark states that is insensitive to magnetic field variations and noise, improving reliability over existing methods.

Findings

The proposed method effectively polarizes nuclear spins with different hyperfine couplings.

It demonstrates robustness against magnetic field inclination and noise.

The approach requires fewer repetitions than previous schemes.

Abstract

The nuclear spin in the vicinity of a nitrogen-vacancy (NV) center possesses of long coherence time and convenient manipulation assisted by the strong hyperfine interaction with the NV center. It is suggested for the subsequent quantum information storage and processing after appropriate initialization. However, current experimental schemes are either sensitive to the inclination and magnitude of the magnetic field or require thousands of repetitions to achieve successful realization. Here, we propose polarizing a 13C nuclear spin in the vicinity of an NV center via a dark state. We demonstrate theoretically that it is robust to polarize various nuclear spins with different hyperfine couplings and noise strengths.