Navigation Links
NIST's second 'quantum logic clock' based on aluminum ion is now world's most precise clock
Date:2/4/2010

her than microwave frequencies used in NIST-F1 and other similar time standards around the world. Optical clocks thus divide time into smaller units, and could someday lead to time standards more than 100 times as accurate as today's microwave standards. Higher frequency is one of a variety of factors that enables improved precision and accuracy.

Aluminum is one contender for a future time standard to be selected by the international community. NIST scientists are working on five different types of experimental optical clocks, each based on different atoms and offering its own advantages. NIST's construction of a second, independent version of the logic clock proves it can be replicated, making it one of the first optical clocks to achieve that distinction. Any future time standard will need to be reproduced in many laboratories.

NIST scientists evaluated the new logic clock by probing the aluminum ion with a laser to measure the exact "resonant" frequency at which the ion jumps to a higher-energy state, carefully accounting for all possible deviations such as those caused by ion motions. No measurement is perfect, so the clock's precision is determined based on how closely repeated measurements can approach the atom's exact resonant frequency. The smaller the deviations from the true value of the resonant frequency, the higher the precision of the clock.

Physicists also evaluate the performance of new optical clocks by comparing them to older optical clocks. In this case, NIST scientists compared their two logic clocks by using the resonant laser frequency from one clock to probe the ion in the other clock. Fifty-six separate comparisons were made, each lasting between 15 minutes and 3 hours.

The two logic clocks exhibit virtually identical "tick" ratesdifferences don't show up until measurements are extended to 17 decimal places. The agreement between the two aluminum clocks is more than 10 times closer than any previous two
'/>"/>

Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. Dynavax Issued Landmark Patent Covering Second-Generation TLR9 Agonists
2. BitWine (TM) Nutrition Advisors Network Expands Roster of Licensed Dietitians and Nutritionists
3. Pharmos Announces Agreement to Sell Certain CB2 Selective Agonists
4. Healthcare Technologies Reports Loss for 2007 Second Quarter & Six Months Results
5. Skystar Bio-Pharmaceutical Announces Second Quarter 2007 Results
6. China Biopharmaceuticals Holdings Announces Second Quarter 2007 Financial Results
7. Dragon Pharmaceutical Reports Growth in Sales and Profits during Second Quarter of 2007
8. Carrington Reports Second Quarter 2007 Results
9. Response Genetics Reports Second Quarter 2007 Financial Results
10. Cadence Pharmaceuticals Reports Second Quarter 2007 Financial Results
11. Transgenomic, Inc. Reports Second Quarter 2007 Results
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
NIST's second 'quantum logic clock' based on aluminum ion is now world's most precise clock
(Date:1/15/2014)... RedBrick Health , a fast-growing leader in consumer ... EmblemHealth , the New York ... the RedBrick Compass health assessment, combined with the RedBrick ... members. EmblemHealth is among the first health plans in ...
(Date:1/15/2014)... 2014 The Microcompetition with Foreign DNA theory ... of these latent viruses is the Epstein Barr Virus (EBV), ... arthritis (RA) is a chronic inflammatory disease that destroys the ... that RA patients have high concentrations of EBV DNA in ...
(Date:1/15/2014)... TaiGen Biotechnology Company, Limited ("TaiGen") today announced that ... leading Russian pharmaceutical company, to develop and commercialize nemonoxacin ... , Turkey and other ... novel antibiotic for the treatment of bacterial infections including ...
(Date:1/14/2014)... Calif. , Jan. 14, 2014 As pet owners drew ... doubt many of them wrote: "Take better care of my furry ... even designer clothes and top-brand carrying cases to take the little ... parents might also feel compelled to buy some pricey toys at ...
Breaking Biology Technology:EmblemHealth Selects RedBrick Health to Power its Next-Generation Health Engagement and Behavior Change System 2EmblemHealth Selects RedBrick Health to Power its Next-Generation Health Engagement and Behavior Change System 3Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 2TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 4New Year's Resolution: Give Pets the Gift of Top-Notch Health Care 2
... Calif., July 22 CV Therapeutics,Inc. (Nasdaq: CVTX ... results for 2008 after the market closes on Thursday, ... at 5:00 p.m. EDT,2:00 p.m. PDT, on the company,s ... on to the Company,s website at, http://www.cvt.com and ...
... is bringing aboard Ashton S. Maaraba, a key Pharmacy, Pharmacy Services ... , ... (PRWEB) July 22, 2008 -- PharmaSmart International ... Ashton S. Maaraba, a key Pharmacy, Pharmacy Services & HBC industry ...
... U.S. Department of Energy,s Lawrence Berkeley National Laboratory (Berkeley ... performed the first scanning tunneling spectroscopy of graphene flakes ... latest in a series of surprising insights into the ... carbon: an unexpected gap-like feature in the energy spectrum ...
Cached Biology Technology:CV Therapeutics to Announce 2008 Second Quarter Financial Results on Thursday, July 31, 2008 2Pharmasmart International Taps Top Executive Ashton Maaraba to Head Global Sales and Marketing 2A phonon floodgate in monolayer carbon 2A phonon floodgate in monolayer carbon 3A phonon floodgate in monolayer carbon 4A phonon floodgate in monolayer carbon 5
(Date:7/9/2014)... developed by researchers at the NIH,s National ... its collaborators to treat sickle cell disease ... business. The drug candidate, Aes-103, is the ... molecular mechanism of sickle cell disease. Baxter ... required for regulatory approval and commercialization. , ...
(Date:7/9/2014)... receptor antagonists can alleviate the symptoms of ... cognitive dysfunction and effectively scavenge amyloid beta ... (Aβ) vaccines reduced and eliminated Aβ deposition ... model, and significantly improved behavioral and cognitive ... First Affiliated Hospital of China Medical University, ...
(Date:7/9/2014)... inhabitants of the sea: tiny haptophytes of the type ... eye, when they are in bloom in spring, they ... on satellite images. "Together with other phytoplankton, Emiliania ... global photosynthesis output," states Prof. Dr. Georg Pohnert of ... the greenhouse gas carbon dioxide CO2 is ...
Breaking Biology News(10 mins):First drug candidate from NIH program acquired by biopharmaceutical company 2First drug candidate from NIH program acquired by biopharmaceutical company 3First drug candidate from NIH program acquired by biopharmaceutical company 4Short circuit in the food web 2
... tropical parasitic disease that can lead to life-threatening heart ... than previously thought, according to research from The University ... for four years now, and this year the number ... professor of integrative biology and philosophy at The University ...
... Cincinnati, OH, October 6, 2011 -- Directly advertising food ... providers, and the American Academy of Pediatrics and the ... impact of advertising on children,s healthy food choices. ... Journal of Pediatrics explores the relationship between ...
... can ever know about long-gone creatures is what they ... resurrect actual specimens and compare their features with their ... Toronto biologists helping to create a seed bank that ... allowing them to measure evolution caused by global change. ...
Cached Biology News:Chagas disease may be a threat in South Texas, says researcher 2Study suggests children's food choices are affected by direct advertising and parental influence 2Seed time-capsule will aid study of plant evolution amid environmental change 2