U.S. flag

An official website of the United States government

Dot gov

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.

Https

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.

Physical Measurement Laboratory

Time and Frequency Division

The Time and Frequency Division maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology.

NIST on a chip

NIST-on-a-Chip in ADI
NIST-F1 Cesium Fountain Atomic Clock

NIST-F1 Cesium Fountain Atomic Clock
Yb Lattice Clock

Yb Lattice Clock

NASA Builds Atomic Clock for Deep-Space Navigation

John Lowe

Time and Frequency Division's own John Lowe spoke about atomic clocks in Voice of America (VOA) George Putic's video report on NASA's next launch.

From VOA's website: "Only days after the spectacular liftoff of what is currently the heaviest space rocket, the privately built Falcon Heavy, NASA announced the next launch will carry a specially built atomic clock. The new device, much smaller and sturdier than earth-bound atomic clocks, will help future astronauts navigate in deep space."

Popular Links

News and Updates

Events

2020 Time and Frequency Seminar

Tue, Sep 15 - Thu, Sep 17 2020
NIST is closely monitoring guidance from Federal, State, and local health authorities on the outbreak of COVID-19. To

Industry Impacts

Close up of the NIST chip-scale atomic clock

Navigation through Timekeeping

Accurate navigation requires precision timing synchronization to about 1 billionth of a second per day. New applications require timing mechanisms that can

Projects and Programs

Compact Cold Atom Clock

Compact Cold Atom Instruments

The cooling of atoms to microkelvin temperatures using lasers is currently enabling a new generation of precision instruments that take advantage of the long

Awards

Nobel Prize

2012 Nobel Prize in Physics to Dave Wineland of NIST Time and Frequency Division

Dave Wineland, of the Ion Storage Group, shares the 2012 Nobel Prize in Physics with Serge Haroche of France "for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems." Dave and his colleagues use these techniques for research in quantum information processing, quantum simulation, atomic clocks, and other areas.

More information about the Ion Storage Group can be found here.

For more information about the 2012 Nobel Prize in Physics, please see the Nobel Prize organization site.

Selected Publications

Contacts

Division Chief

Division Secretary