Portable Precision: A New Type of Atomic Clock

December 10, 2008,

(PhysOrg.com) -- The most accurate atomic clocks in the world are based on the output of cesium atoms. These ultra-precise fountain clocks measure the frequency and time interval of seconds by using a fountain-like movement of cesium atoms. Unfortunately, fountain clocks aren’t easily transportable- they tend to be huge, stationary apparatuses stuck in laboratories.

Physicists from the University of New South Wales, Australia and the University of Nevada, Reno propose a method to reduce the size of atomic clocks to handy, compact devices using specially engineered optical lattices.

Optical lattices are created by trapping atoms in a standing wave light field formed by laser beams. But the lasers can hamper the time keeping ability of the atoms. By applying an external magnetic field to the lattice in a specific direction, the atomic clock is rendered insensitive to the laser field strength. This property allows the atomic clock to function properly at a smaller size.

While a portable cesium clock could benefit numerous scientific and general applications, the expected accuracy of the optical lattice clocks has yet to be explored. Calling for further theoretical and experimental investigation, the authors assert that even if the precision of such clocks turns out to be less competitive than the fountains, the optical lattice clocks have a clear advantage of a smaller apparatus size, making them useful in applications like navigation systems and precision tests of fundamental symmetries in space.

Article: V.V. Flambaum, V.A. Dzuba, and A. Derevianko, Physical Review Letters (forthcoming)

Provided by APS

Explore further: Astronomers discover first direct evidence of white dwarf stars solidifying into crystals

Related Stories

ESA sets clock by distant spinning stars

December 28, 2018

ESA's technical centre in the Netherlands has begun running a pulsar-based clock. The "PulChron' system measures the passing of time using millisecond-frequency radio pulses from multiple fast-spinning neutron stars.

Next up: Ultracold simulators of super-dense stars

January 3, 2019

Rice University physicists have created the world's first laser-cooled neutral plasma, completing a 20-year quest that sets the stage for simulators that re-create exotic states of matter found inside Jupiter and white dwarf ...

Physicists record 'lifetime' of graphene qubits

December 31, 2018

Researchers from MIT and elsewhere have recorded, for the first time, the "temporal coherence" of a graphene qubit—meaning how long it can maintain a special state that allows it to represent two logical states simultaneously. ...

Recommended for you

Mechanism helps explain the ear's exquisite sensitivity

January 16, 2019

The human ear, like those of other mammals, is so extraordinarily sensitive that it can detect sound-wave-induced vibrations of the eardrum that move by less than the width of an atom. Now, researchers at MIT have discovered ...

Understanding insulators with conducting edges

January 16, 2019

Insulators that are conducting at their edges hold promise for interesting technological applications. However, until now their characteristics have not been fully understood. Physicists at Goethe University have now modelled ...

4 comments

Adjust slider to filter visible comments by rank

Display comments: newest first

theophys
5 / 5 (1) Dec 10, 2008
Great, pretty soon we'll have digital watches that can tell us how many picoseconds we have to get where we are going. We'll still be late, but we'll know exactly how late we are.
schultz911
not rated yet Dec 11, 2008
Well, all in the name of scientific progress and commercialism. But you cant deny its importance in certain fields, knowing time periods to that precision could considerably affect certain calculations.
theophys
not rated yet Dec 11, 2008
Well, all in the name of scientific progress and commercialism. But you cant deny its importance in certain fields, knowing time periods to that precision could considerably affect certain calculations.


Of course.
MrP
not rated yet Dec 13, 2008
A comment to the author: cesium Atomic clocks are already portable http://tycho.usno...ium.html . Cesium fountain atomic clocks on the other hand, are not.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.