Implementation of integrated nonlocal sensing for object shape and rotational speed

The expeditious acquisition of information pertaining to objects through the utilization of quantum technology has been a perennial issue of concern. So far, the efficient utilization of information from dynamic objects with limited resources remains a significant challenge. Here, we realize a nonlocal integrated sensing of the object’s amplitude and phase information by combining digital spiral imaging with the correlated orbital angular momentum states. The amplitude information is utilized for object identification, while the phase information enables us to determine the rotational speed. We demonstrate the nonlocal identification of a rotating object’s shape, irrespective of its rotational symmetry, and introduce the concept of the correlated rotational Doppler effect, establishing a fundamental connection between this effect and the classical rotational Doppler effect, i.e., that both rely on extracting crucial information from the spiral spectrum of objects. The present study highlights a promising pathway towards the realization of quantum remote sensing and imaging.