  Quantum sensors represent a new generation of sensors with improved
precision, accuracy, stability, and robustness to environmental effects
compared to their classical predecessors. After decades of laboratory
development, several types of quantum sensors are now commercially available or
are part-way through the commercialization process. This article provides a
brief description of the operation of a selection of quantum sensors that
employ the principles of atom-light interactions and discusses progress toward
packaging those sensors into products. This article covers quantum inertial and
gravitational sensors, including gyroscopes, accelerometers, gravimeters, and
gravity gradiometers that employ atom interferometry, nuclear magnetic
resonance gyroscopes, atomic and spin-defect magnetometers, and Rydberg
electric field sensors.
