Research progress of electromagnetic wave measurement using cesium atoms at NMIJ

In recent years, the measurement of electromagnetic waves using atoms has gained global attention. National Metrology Institute of Japan (NMIJ) began researching quantum measurement in 2008 and has since developed technologies for measuring microwave power, free-space antennas, and visualizing electromagnetic waves. This paper reviews the progress of research on quantum measurement of electromagnetic waves using cesium atoms at NMIJ.