The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Groups

Physical Measurement Laboratory

Quantum Measurement Division

Groups

Applied Electrical Metrology Group

Welcome to the Applied Electrical Metrology Group

Atomic Spectroscopy Group

The mission of the Atomic Spectroscopy Group is to measure, calculate, critically compile, and disseminate reference

Fundamental Constants Data Center

The Fundamental Constants Data Center is focused on physics relevant to the determination of values of the fundamenta

Fundamental Electrical Measurements Group

The Fundamental Electrical Measurements group supports the nation's infrastructure by providing calibration serv

Laser Cooling and Trapping Group

We use ultracold gases and other atomic systems to study quantum phenomena including many-body physics, superfluidity

Mass and Force Group

The Group provides traceability for the SI units of mass and force, measurement services, and research in support of

Quantum Optics Group

Our group studies and develops techniques relying on quantum optics and quantum optics-based components for new measu