RF signal reception and application demonstrations using a portable atomic receiver*

We present a compact and portable Atomic Receiver (ARX) and front-end for detection and measurement of RF signals across multiple bands. The receiver is based on the high electric-field sensitivity of Rydberg atoms to provide accurate, reliable, drift-free and calibration-free RF sensing and measurement across a wide spectral range spanning from megahertz to tens of gigahertz using a single sub-cm$^3$ probe head. The compact design of the ARX makes it easy to use and transport for fieldable demonstrations, flexible real-time RF signal collection, signal processing, and analysis, making it a reliable tool for applications in RF metrology, test and measurement, communications, and surveillance. Here we will present the ARX, its performance capabilities, and application demonstrations in signal reception across HF, VHF, UHF and SHF bands.