Quantum Sensing using Nitrogen Vacancy (NV) Centers in Nanodiamonds under Extreme Conditions

The nitrogen vacancy (NV) center in diamond is a well-known point defect that offers a promising platform for realizing practical quantum technologies. Using optics for high-fidelity spin-state initialization and readout, reliable quantum sensing can be performed. Thus, we can extract various physical parameters from the optically detected magnetic resonance spectrum. In our recent works, we implemented NV centers in nanodiamond as sensors under extreme conditions. First, we measured the Meissner effect of a type-II superconductor under pressure and constructed phase diagrams. This is a powerful tool in the study of quantum physics in strongly correlated systems under pressure. Meanwhile, we examined the hydrostaticity of a pressure medium and showed the pressure gradient induced by both pressure and temperature. This is essential for the understanding of the pressure-induced phenomenon. Finally, we measured the dynamics of the curing of polydimethylsiloxane and the polymerization of cyanoacrylate. This benefits the polymer research.