By imaging the standing-wave pattern of 40 GHz radiation inside a rubidium vapor cell, the authors measure the radio wave's angle of arrival to about one degree in-plane and several degrees out-of-plane.
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Angle-of-arrival detection of radio-frequency waves via Rydberg atom fluorescence imaging of standing waves in a glass vapor cell
By imaging the standing-wave pattern of 40 GHz radiation inside a rubidium vapor cell, the authors measure the radio wave's angle of arrival to about one degree in-plane and several degrees out-of-plane.