Practical applications of quantum sensing: a simple method to enhance sensitivity of Nitrogen-Vacancy-based temperature sensors

Abstract

Nitrogen-vacancy centers in diamond allow measurement of environment properties such as temperature, magnetic and electric fields at nanoscale level, of utmost relevance for several research fields, ranging from nanotechnologies to bio-sensing. The working principle is based on the measurement of the resonance frequency shift of a single nitrogen-vacancy center (or an ensemble of them), usually detected by by monitoring the center photoluminescence emission intensity. Albeit several schemes have already been proposed, the search for the simplest and most effective one is of key relevance for real applications. Here we present a new continuous-wave lock-in based technique able to reach unprecedented sensitivity in temperature measurement at micro/nanoscale volumes (4.8 mK/Hz${}^{1/2}$ in $\mu$m${}^3$). Furthermore, the present method has the advantage of being insensitive to the enviromental magnetic noise, that in general introduces a bias in the temperature measurement.

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• Efficient fabrication of high-density ensembles of color centers via ion implantation on a hot diamond substrate
• Multiparameter estimation for qubit states with collective measurements: a case study
• Vector detection of AC magnetic fields by Nitrogen-Vacancy centers of single orientation in diamond
• Lock-in thermography using diamond quantum sensors
• Magnetic field orientation dependence of continuous-wave optically detected magnetic resonance with nitrogen-vacancy ensembles
• Magnetic Signature of Thermo-Electric Cardiac Dynamics
• Bayesian quantum thermometry based on thermodynamic length
• Configuration-dependent precision in magnetometry and thermometry using multi-qubit quantum sensors
• Highly sensitive temperature sensing via quadratic optomechanical coupling
• Interplay between dressed and strong-axial-field states in Nitrogen-Vacancy centers for quantum sensing and computation
• Imaging of microwave magnetic field orientation using continuous-wave experiments on nitrogen-vacancy centers in diamond