Development of solid-state quantum diamond microscope in high-pressure, high-temperature environments*

In geoscience, researchers study minerals in the Earth's interior that are extremely high in pressure and temperature. The mainstream technique for mimicking such conditions combines a diamond anvil cell (DAC) with a resistive or laser heater. However, to date, no method allows imaging the magnetic field of the inside of a high-temperature DAC with nanometer-scale spatial resolution. The diamond's nitrogen-vacancy (NV) center is a promising quantum sensor to satisfy this need. Recently, researchers demonstrated magnetic and pressure imaging inside the DAC with micrometer-scale resolution by creating a thin layer of NV centers near the surface of a diamond anvil. Here, we present our recent progress on NV-based imaging under high-pressure and high-temperature conditions using an NV-implanted DAC combined with a resistive heater made of a platinum thin wire. Our new sensor device may provide valuable information about the material properties of the Earth's environment.