Selective temperature sensing in nanodiamonds using dressed states

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.