Results 231 to 240 of about 100,070 (278)
Some of the next articles are maybe not open access.
18th IEEE International Conference on Micro Electro Mechanical Systems, 2005. MEMS 2005., 2005
We summarize the development of microfabricated atomic frequency references at NIST. The physics packages of these devices have volumes near 10 mm/sup 3/ and power dissipation below 150 mW, and can potentially achieve a fractional frequency instability in the range of 10/sup -11/ over long periods.
J. Kitching +6 more
openaire +1 more source
We summarize the development of microfabricated atomic frequency references at NIST. The physics packages of these devices have volumes near 10 mm/sup 3/ and power dissipation below 150 mW, and can potentially achieve a fractional frequency instability in the range of 10/sup -11/ over long periods.
J. Kitching +6 more
openaire +1 more source
Metrologia, 2005
We describe and review the current state of the art in atomic fountain clocks. These clocks provide the best realization of the SI second possible today, with relative uncertainties of a few parts in 1016.
R Wynands, S Weyers
openaire +1 more source
We describe and review the current state of the art in atomic fountain clocks. These clocks provide the best realization of the SI second possible today, with relative uncertainties of a few parts in 1016.
R Wynands, S Weyers
openaire +1 more source
2016 Conference on Precision Electromagnetic Measurements (CPEM 2016), 2016
We precisely control the quantum states of more than 1000 strontium atoms to achieve a more stable and accurate atomic clock than any existing atomic clocks, with both stability and uncertainty reaching the 10−18 level. Such advanced clocks will allow us to test fundamental laws of nature and fuel applications in a wide range of technological frontiers.
openaire +1 more source
We precisely control the quantum states of more than 1000 strontium atoms to achieve a more stable and accurate atomic clock than any existing atomic clocks, with both stability and uncertainty reaching the 10−18 level. Such advanced clocks will allow us to test fundamental laws of nature and fuel applications in a wide range of technological frontiers.
openaire +1 more source
SPIE Proceedings, 2000
We demonstrate a prototype of a laser-cooled 87Rb fountain clock and measure the frequency shift due to cold collisions. The shift is 30 times smaller than that in a laser-cooled Cs clock. We observe a density dependent pulling by the microwave cavity and use it to cancel the collision shift.
Chad Fertig, Kurt Gibble
openaire +1 more source
We demonstrate a prototype of a laser-cooled 87Rb fountain clock and measure the frequency shift due to cold collisions. The shift is 30 times smaller than that in a laser-cooled Cs clock. We observe a density dependent pulling by the microwave cavity and use it to cancel the collision shift.
Chad Fertig, Kurt Gibble
openaire +1 more source
Intense, Narrow Atomic-Clock Resonances
Physical Review Letters, 2004We present experimental and theoretical results showing that magnetic resonance transitions from the "end" sublevels of maximum or minimum spin in alkali-metal vapors are a promising alternative to the conventional 0-0 transition for small-size gas-cell atomic clocks.
Y-Y, Jau +5 more
openaire +2 more sources
Atomic Clocks and Atom Interferometry
2002We show that the language of atom interferometry [1] provides a unified picture for microwave and optical atomic clocks as well as for gravito-inertial sensors. The sensitivity and accuracy of these devices, is now such that a new theoretical framework [2] common to all these interferometers, is required and which includes: 1 - A fully quantum ...
openaire +1 more source
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), 2019
For many centuries, and continuing today, a primary application of accurate clocks is for precise navigation. For example, GPS enables us to determine our distance from the (known) positions of satellites by measuring the time it takes for a pulse of radiation emitted by the satellite to reach us.
openaire +1 more source
For many centuries, and continuing today, a primary application of accurate clocks is for precise navigation. For example, GPS enables us to determine our distance from the (known) positions of satellites by measuring the time it takes for a pulse of radiation emitted by the satellite to reach us.
openaire +1 more source
Evolutionary-scale prediction of atomic-level protein structure with a language model
Science, 2023, , Roshan Rao
exaly
Nuclear clock could steal atomic clock's crown
New Scientist, 2011The ultimate timekeeper – the atomic clock – has a rival, thanks to a new method for making clocks based on manipulating the atomic ...
openaire +1 more source