Purcell-enhanced optical spin readout of Nitrogen-Vacancy centers in diamond

TL;DR

This paper analyzes how Purcell enhancement can improve optical spin readout of Nitrogen-Vacancy centers in diamond, proposing optimal parameters for maximizing signal-to-noise ratio at room temperature.

Contribution

It provides a theoretical framework for optimizing Purcell-enhanced optical coupling to improve NV spin readout performance.

Findings

Optimal parameters for maximal SNR identified

Combined increase in spontaneous emission and excitation improves readout

Theoretical analysis guides experimental design

Abstract

Nitrogen-Vacancy (NV) color centers in diamond have emerged as promising quantum solid-state systems, with applications ranging from quantum information processing to magnetic sensing. One of the most useful properties of NVs is the ability to read their ground-state spin projection optically at room temperature. This work provides a theoretical analysis of Purcell enhanced NV optical coupling, through which we find optimal parameters for maximal Signal to Noise Ratio (SNR) of the optical spin-state readout. We conclude that a combined increase in spontaneous emission (through Purcell enhancement) and in optical excitation could significantly increase the readout SNR.