  Quantum sensing is a rapidly growing approach to probe fundamental physics
and explore new phase space for possible new physics with precision and highly
sensitive measurements in our quest to understand the deep structure of matter
and its interactions. This field uses properties of quantum mechanics in the
detectors to go beyond traditional measurement techniques. Key particle physics
topics where quantum sensing can play a vital role include neutrino properties,
tests of fundamental symmetries (Lorentz invariance and the equivalence
principle as well as searches for electric dipole moments and possible
variations in fundamental constants), the search for dark matter and testing
ideas about the nature of dark energy. Interesting new sensor technologies
include atom interferometry, optomechanical devices, and atomic and nuclear
clocks including with entanglement. This Perspective explores the opportunities
for these technologies in future particle physics experiments, opening new
windows on the structure of the Universe.
