The Pauli exclusion principle is a cornerstone of the Standard Model of particle physics and is essential for the structure and stability of matter. Now an international collaboration of physicists ...

A cloud of ultracold atoms is like a motel with a neon “no vacancy” sign. If a guest at the motel wants to switch rooms, they’re out of luck. No vacant rooms means there’s no choice but to stay put.

Blue blocker: blue laser light is used at JILA to measure how quantum statistics can affect light scattering in an ultracold gas of strontium atoms. (Courtesy: Christian Sanner, Ye labs/JILA) A ...