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Quantum projection noise in an atomic fountain: a high stability cesium frequency standard
[1], wheret is the averaging time in seconds. Yet, all these experi-ments were limited by technical noise rather than by thefundamental quantum noise inherent to the measurementprocess [7,8]. It wasExpand
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Frequency stability degradation of an oscillator slaved to a periodically interrogated atomic resonator
Atomic frequency standards using trapped ions or cold atoms work intrinsically in a pulsed mode. Theoretically and experimentally, this mode of operation has been shown to lead to a degradation ofExpand
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Search for variations of fundamental constants using atomic fountain clocks.
Over five years, we have compared the hyperfine frequencies of 133Cs and 87Rb atoms in their electronic ground state using several laser-cooled 133Cs and 87Rb atomic fountains with an accuracy ofExpand
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Progress in atomic fountains at LNE-SYRTE
We give an overview of the work done with the Laboratoire National de Metrologie et d'Essais-Systemes de Reference Temps-Espace (LNE-SYRTE) fountain ensemble during the last five years. After aExpand
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New limits on the drift of fundamental constants from laboratory measurements.
We have remeasured the absolute 1S-2S transition frequency nu(H) in atomic hydrogen. A comparison with the result of the previous measurement performed in 1999 sets a limit of (-29+/-57) Hz for theExpand
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High contrast Ramsey fringes with coherent-population-trapping pulses in a double lambda atomic system.
We report the observation of Raman-Ramsey fringes using a double lambda scheme creating coherent population trapping in an atomic ensemble combined with pulsed optical radiations. The observation wasExpand
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Doppler-free spectroscopy of the 1S0-3P0 optical clock transition in laser-cooled fermionic isotopes of neutral mercury.
We report direct laser spectroscopy of the 1S0-3P0 transition at 265.6 nm in fermionic isotopes of neutral mercury in a magneto-optical trap. Measurements of the frequency against the LNE-SYRTEExpand
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Efficient cooling and trapping of strontium atoms.
We report the capture of cold strontium atoms in a magneto-optical trap (MOT) at a rate of 4 x 10(10) atoms/s. The MOT is loaded from an atomic beam decelerated by a Zeeman slower operating with aExpand
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Improved test of Lorentz invariance in electrodynamics
We report new results of a test of Lorentz invariance based on the comparison of a cryogenic sapphire microwave resonator and a hydrogen-maser. The experimental results are shown together with anExpand
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Whispering Gallery Resonators and Tests of Lorentz Invariance
The frequencies of a cryogenic sapphire oscillator and a hydrogen maser are compared to set new constraints on a possible violation of Lorentz invariance. We give a detailed description of microwaveExpand
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