  The applications of spin-based quantum sensors to measurements probing
fundamental physics are surveyed. Experimental methods and technologies
developed for quantum information science have rapidly advanced in recent
years, and these tools enable increasingly precise control and measurement of
spin dynamics. Theories of beyond-the-Standard-Model physics predict, for
example, symmetry violating electromagnetic moments aligned with particle
spins, exotic spin-dependent forces, coupling of spins to ultralight bosonic
dark matter fields, and changes to the local environment that affect spins.
Spin-based quantum sensors can be used to search for these myriad phenomena,
and offer a methodology for tests of fundamental physics that is complementary
to particle colliders and large scale particle detectors. Areas of
technological development that can significantly enhance the sensitivity of
spin-based quantum sensors to new physics are highlighted.
