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Precision Optical Frequency Metrology

Content About: Precision Optical Frequency Metrology

Published: 06/28/2016 - 9:04am Type of Content: Article-Research Highlight

Fellow Judah Levine recently presented a discussion of our understanding of time from antiquity to the present day in an insightful paper published in the April 2016 issue of the European Physical Journal H.

Levine recounted that for at least 7000 years, the measurement of time has been linked to the rotation of the Earth, the lunar cycle, the path of the Earth around the Sun, and other...

Published: 03/31/2016 - 10:20am Type of Content: Article-Research Highlight

The Ye and Rey groups have discovered the strange rules of quantum baseball in which strontium (Sr) atoms are the players, and photons of light are the balls. The balls control the players by not only getting the atoms excited, but also working together. The players coordinate throwing and catching the balls. While this is going on, the balls can change the state of the players! Sometimes the...

Published: 12/16/2015 - 12:31pm Type of Content: News

President Obama has selected JILA Fellow Jun Ye of NIST's Quantum Physics Division to receive a 2015 Presidential Rank Award. The award cited Ye's work advancing "the frontier of light-matter interaction and focusing on precision measurement, quantum physics and ultracold matter, optical frequency metrology, and ultrafast science."

The Presidential Rank Awards honor a select group...

Published: 09/18/2015 - 8:31am Type of Content: News

Jun Ye gave a fascinating talk entitled "Let There Be Light (and Thus, Time)" at a DARPA conference on Friday Sept. 11 in St. Louis. Ye described how ultrasensitive lasers can measure the very nature of time as well as the ever-changing distance between the Earth and the Moon. Ye's talk was highlighted the following week in a Sept. 15 article by Rebecca Boyle in...

Published: 04/16/2015 - 9:06am Type of Content: News

APS Physics has produced a lovely story entitled The World's Time by Andrei Derevianko on its Forum on International Physics. The story features Judah Levine, Jun Ye and other scientists from around the world. 

Published: 06/13/2014 - 3:21pm Type of Content: Article-Research Highlight

Imagine a network of multiple clocks orbiting the Earth, not only reporting down to us, but also collaborating quantum mechanically among themselves to operate precisely in sync as a single global superclock, or world clock. The world clock is delivering the most precise timekeeping in all of human history—to every member nation regardless of politics, alliances, or behavior on the ground....

Published: 01/22/2014 - 11:16am Type of Content: Article-Research Highlight

JILA and NIST labs are well on the way to creating astonishingly accurate optical atomic clocks based on the neutral atoms strontium (Sr) and ytterbium (Yb). The new technologies are already capable of the most meticulous timekeeping in human history.

JILA Fellow Jun Ye’s group has developed an optical atomic clock that uses neutral Sr atoms held in an optical lattice (i.e., crystal of...

Published: 07/26/2013 - 8:34am Type of Content: News

Graduate student Travis Nicholson (Ye group) handily won the competition for Best Student Paper at the joint  symposium of the IEEE-International Frequency Control Symposium (IFCS), the IEEE-International Ultrasonics Symposium (IUS), the IEEE-International Symposium on the Applications of Ferroelectric (ISAF) and the Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar...

Published: 04/09/2013 - 2:55pm Type of Content: Article-Research Highlight

The world’s most stable optical atomic clock resides in the Ye lab in the basement of JILA’s S-Wing. The strontium-(Sr-)lattice clock is so stable that its frequency measurements don’t vary by more than 1 part in 100 quadrillion (1 x 10-17) over a time period of 1000 seconds, or 17 minutes. This impressive result was obtained by lead graduate student Travis Nicholson, graduate students Mike...

Published: 04/10/2013 - 11:49am Type of Content: Article-Research Highlight

Researchers from a German national laboratory, the Physikalisch-Technische Bundesanstalt (PTB) have collaborated with Fellow Jun Ye, Visiting Fellow Lisheng Chen (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), and graduate student Mike Martin to come up with a clever approach to reducing heat-related “noise” in interferometers. Interferometers are widely used...

Published: 02/02/2011 - 5:00pm Type of Content: Article-Research Highlight

Quantum Paradox Derails Unwanted Collisions

In 2008-2009, much to their amazement,researchers working on the Jun Ye group’s neutral Sr optical atomic clock discovered tiny frequency shifts caused by colliding fermions! They figured out that the clock laser was interacting slightly differently with the Sr atoms inside a one-dimensional (pancake-shaped) trap. The light-atom...

Published: 04/08/2009 - 6:00pm Type of Content: Article-Research Highlight

According to the laws of quantum mechanics, identical fermions at very low temperatures can’t collide. These unfriendly subatomic particles, atoms, or molecules simply will not share the same piece of real estate with an identical twin. A few years back, researchers in the Ye lab considered this unneighborly behavior a big advantage in designing a new optical atomic clock based on an ensemble...

Published: 06/24/2013 - 11:29am Type of Content: Research Areas

Precision optical frequency metrology relies on new laser technologies developed by JILA scientists. These technologies include one of the world’s most stable lasers, which is used with the strontium (Sr)-lattice optical atomic clocks and quantum simulator in the Ye labs, a super-radiant laser, (3) a mid-infrared (IR) frequency comb developed for molecular fingerprinting and control, and...

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