Science Daily  April 5, 2021 Previously NIST researchers had demonstrated that atom-based sensors can receive commonly used communications signals. Now a team of researchers in the US (University of Colorado, NIST) used a Rydberg atom-based sensor for determining the angle of arrival of an incident RF signal, key part for a potential atomic communications system. They measured phase differences of a 19.18 gigahertz experimental signal at two locations inside the vapor cell for various angles of arrival. Comparisons of these measurements with both the full-wave simulation and the plane wave theoretical model show that the atom-based sub-wavelength phase measurements can […]