Researchers at the U.S. Army Combat Capabilities Development Command (DEVCOM) have developed a revolutionary quantum sensor capable of measuring the full 3D direction of radio-frequency electromagnetic fields. This advancement aims to significantly improve situational awareness and secure communications for soldiers on the battlefield. The sensor employs Rydberg atoms, which are highly sensitive to electric fields, enabling it to detect both the strength and the 3D orientation of electromagnetic fields. Unlike conventional sensors that measure in one direction, this quantum sensor offers a complete picture of signal direction and motion, achieving an accuracy of approximately two degrees. This compact device can operate across the entire radio-frequency spectrum, making it adaptable to the complex and crowded signal environments typical in modern warfare. David Meyer, a research physicist at the Army Research Laboratory (ARL), emphasized the sensor's potential to transform battlefield operations by providing a unified platform for spectrum awareness. The research builds upon previous work, including the development of the Rydberg electrometer, and was published in the journal Physical Review Applied.