Selective temperature sensing in nanodiamonds using dressed states

TL;DR

This paper introduces a method using dressed states to enhance the temperature sensitivity of nitrogen vacancy centers in diamond, suppressing magnetic interference and improving measurement specificity at the nanoscale.

Contribution

The study demonstrates a straightforward approach to engineer the sensor Hamiltonian, achieving selective temperature sensing with reduced magnetic sensitivity in nanodiamonds.

Findings

Magnetic sensitivity reduced by a factor of seven.

Full temperature sensitivity retained.

Linewidth of NV centers narrowed.

Abstract

Temperature sensing at the nanoscale is a significant experimental challenge. Here, we report an approach using dressed states to make a leading quantum sensor (the nitrogen vacancy (NV) center in diamond) selectively sensitive to temperature, even in the presence of normally-confounding magnetic fields. Using an experimentally straightforward approach, we are able to suppress the magnetic sensitivity of the NV center by a factor of seven while retaining full temperature sensitivity and narrowing the NV center linewidth. These results demonstrate the power of engineering the sensor Hamiltonian using external control fields to enable sensing with improved specificity to target signals.