Portable Precision: A New Type of Atomic Clock

Dec 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: New microscope collects dynamic images of the molecules that animate life

add to favorites email to friend print save as pdf

Related Stories

Superconducting circuits, simplified

20 hours ago

Computer chips with superconducting circuits—circuits with zero electrical resistance—would be 50 to 100 times as energy-efficient as today's chips, an attractive trait given the increasing power consumption ...

'Comb on a chip' powers new atomic clock design

Jul 22, 2014

Researchers from the National Institute of Standards and Technology (NIST) and California Institute of Technology (Caltech) have demonstrated a new design for an atomic clock that is based on a chip-scale ...

Recommended for you

Cooling with molecules

Oct 22, 2014

An international team of scientists have become the first ever researchers to successfully reach temperatures below minus 272.15 degrees Celsius – only just above absolute zero – using magnetic molecules. ...

User comments : 4

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.