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The U.S. Army Research Laboratory has demonstrated a compact Rydberg atom sensor capable of measuring the full 3D direction of radio-frequency signals, overcoming the single-axis limitations of conventional antennas. By utilizing rubidium atoms in Rydberg states, this device achieves broadband functionality from DC to terahertz frequencies while maintaining a footprint of just centimeters. This advancement promises to significantly enhance battlefield situational awareness and secure communications by enabling precise mapping of electromagnetic field vectors.
Army Lab Achieves First Quantum K-Vector Measurement

Army scientists demonstrated a Rydberg quantum sensor, achieving the first measurement of a radio-frequency signal’s full 3D direction—its k-vector.
Scientists at the U. S. Army Combat Capabilities Development Command, known as DEVCOM, Army Research Laboratory, have achieved the first measurement of the full 3D direction of radio-frequency electromagnetic fields using a novel quantum sensor. This breakthrough, detailed in a recent publication in Physical Review Applied, moves beyond traditional signal detection methods that only measure field strength in one direction; the new sensor can determine the direction and motion…
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