Results 231 to 240 of about 37,255 (283)
Ultra-stable and high-performance squeezed vacuum source enabled via artificial intelligence control. [PDF]
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ATOMIC CLOCKS AND COLD ATOM SCATTERING
Laser Spectroscopy, 2002We demonstrate a Rb fountain clock which has a small cold collision shift that is cancelled by detuning the microwave cavity. To further enhance the stability and accuracy, we are currently developing a new state detection technique that directly measures population differences and are juggling atoms in the fountain. Fountain clocks also enable a novel
Fertig, C. +5 more
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Atomic and gravitational clocks
Nature, 1982Atomic and gravitational clocks are governed by the laws of electrodynamics and gravity, respectively. While the strong equivalence principle (SEP) assumes that the two clocks have been synchronous at all times, recent planetary data seem to suggest a possible violation of the SEP.
V. M. Canuto, I. Goldman
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AIP Conference Proceedings, 2001
This paper reviews recent progress on microwave clocks using laser cooled neutral atoms. With an ultra-stable cryogenic sapphire oscillator as interrogation oscillator, a cesium fountain operates at the quantum projection noise limit. With 6 105 detected atoms, the relative frequency stability δν/ν is 4 10−14τ−1/2 where τ is the integration time in ...
Y. Sortais, S. Bize, M. Abgrall
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This paper reviews recent progress on microwave clocks using laser cooled neutral atoms. With an ultra-stable cryogenic sapphire oscillator as interrogation oscillator, a cesium fountain operates at the quantum projection noise limit. With 6 105 detected atoms, the relative frequency stability δν/ν is 4 10−14τ−1/2 where τ is the integration time in ...
Y. Sortais, S. Bize, M. Abgrall
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CHARACTERIZATION OF NONSTATIONARY ATOMIC CLOCKS
Fluctuation and Noise Letters, 2007Atomic clocks are the core of a navigation system. Since an error in time results in an error in the user localization, it is fundamental that the stability is very high and constant with time. In this paper we discuss the dynamic Allan variance, or DAVAR, a representation of the time-varying stability of an atomic clock.
GALLEANI L., TAVELLA, PATRIZIA
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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
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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
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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
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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
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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.
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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.
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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
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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
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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
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