Frequency mixing spectroscopy of spins in diamond

TL;DR

This paper explores nonlinear frequency mixing in nitrogen-vacancy centers in diamond, demonstrating advanced magnetic resonance detection techniques and comparing experimental results with theoretical models.

Contribution

It introduces experimental exploration of frequency mixing in NV centers with simultaneous multi-directional magnetic driving and compares results with theoretical predictions.

Findings

Successful magnetic resonance detection using Landau Zener interferometry

Demonstration of two-tone driving spectroscopy in NV centers

Agreement between experimental results and theoretical models

Abstract

Frequency mixing processes in spin systems have a variety of applications in meteorology and in quantum data processing. Spin spectroscopy based on frequency mixing offers some advantages, including the ability to eliminate crosstalk between driving and detection. We experimentally explore nonlinear frequency mixing processes with negatively charged nitrogen-vacancy defects in diamond at low temperatures, and near level anti crossing. The experimental setup allows simultaneously applying magnetic driving in the longitudinal and transverse directions. Magnetic resonance detection is demonstrated using both Landau Zener St\"uckelberg interferometry and two-tone driving spectroscopy. The experimental results are compared with predictions of a theoretical analysis based on the rotating wave approximation.