This article reviews recent developments in tests of fundamental physics using atoms and
molecules, including the subjects of parity violation, searches for permanent electric dipole …

Presently under construction in Lund, Sweden, the European Spallation Source (ESS) will
be the world's brightest neutron source. As such, it has the potential for a particle physics …

Achieving high energy resolution in spin systems is important for fundamental physics
research and precision measurements, with alkali-noble-gas comagnetometers being …

We present the basic theory governing spin-exchange-pumped nuclear magnetic resonance
(NMR) gyros. We review the physics of spin-exchange collisions and relaxation as they …

Dark matter is one of the greatest mysteries in physics. It interacts via gravity and composes
most of our universe, but its elementary composition is unknown. We search for …

We describe a method based on precision magnetometry that can extend the search for
axion-mediated spin-dependent forces by several orders of magnitude. By combining …

The applications of spin-based quantum sensors to measurements probing fundamental
physics are surveyed. Experimental methods and technologies developed for spin-based …

Modern comagnetometry is—in absolute energy units—the most sensitive experimental
technique for measuring the energy splitting between quantum states, with certain …

State-of-the-art magnetic field measurements performed in shielded environments under
carefully controlled conditions rarely reflect the realities of those applications envisioned in …

Among the four fundamental forces, only gravity does not couple to particle spins according
to the general theory of relativity. We test this principle by searching for an anomalous scalar …