Laser-cooled Cs frequency standard and a measurement of the frequency shift due to ultracold collisions

Gibble, Kurt; Chu, Steven

doi:10.1103/physrevlett.70.1771

Cited by 246 publications

(176 citation statements)

References 25 publications

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“…(3), at constant detuning the phase shift is proportional to the density of atoms N . Therefore, given a fixed detuning we can use the DCphase shift as a measure for the number of atoms probed in the MOT [28,29]. We vary the number of atoms trapped by varying the background Caesium pressure in the chamber.…”

Section: E Poisson Noise Of Atomic Populationmentioning

confidence: 99%

Quantum-noise-limited interferometric measurement of atomic noise: Towards spin squeezing on the Cs clock transition

et al. 2005

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We investigate theoretically and experimentally a nondestructive interferometric measurement of the state population of an ensemble of laser cooled and trapped atoms. This study is a step towards generation of (pseudo-) spin squeezing of cold atoms targeted at the improvement of the Caesium clock performance beyond the limit set by the quantum projection noise of atoms. We calculate the phase shift and the quantum noise of a near resonant optical probe pulse propagating through a cloud of cold 133 Cs atoms. We analyze the figure of merit for a quantum non-demolition (QND) measurement of the collective pseudo-spin and show that it can be expressed simply as a product of the ensemble optical density and the pulse integrated rate of the spontaneous emission caused by the off-resonant probe light. Based on this, we propose a protocol for the sequence of operations required to generate and utilize spin squeezing for the improved atomic clock performance via a QND measurement on the probe light. In the experimental part we demonstrate that the interferometric measurement of the atomic population can reach the sensitivity of the order of √ Nat in a cloud of Nat cold atoms, which is an important benchmark towards the experimental realisation of the theoretically analyzed protocol.

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Section: E Poisson Noise Of Atomic Populationmentioning

confidence: 99%

Quantum-noise-limited interferometric measurement of atomic noise: Towards spin squeezing on the Cs clock transition

et al. 2005

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“…The collisional properties of ultracold cesium atoms have intrigued experimentalists and theorists because of their large clock shifts [10], enormous collision cross sections [11], and the extreme difficulty to reach BEC [12]. These anomalies in the atom-atom scattering can be explained by the coupling of the scattering continuum to molecular states.…”

Section: Introductionmentioning

confidence: 99%

Precision Feshbach spectroscopy of ultracoldCs2

et al. 2004

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We have observed and located more than 60 magnetic field-induced Feshbach resonances in ultracold collisions of ground-state 133 Cs atoms. Multiple extremely weak Feshbach resonances associated with g-wave molecular states are detected through variations in the radiative collision cross sections. The Feshbach spectroscopy allows us to determine the interactions between ultracold cesium atoms and the molecular energy structure near the dissociation continuum with unprecedented precision. Our work not only represents a very successful collaboration of experimental and theoretical efforts, but also provides essential information for cesium Bose-Einstein condensation, Cs 2 molecules, and atomic clock experiments.

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“…The ground state s-wave scattering lengths for many of the alkali metal atoms have been obtained from combinations of theory and experiment. Those studies were motivated in part by the need to estimate evaporative cooling rates [1], study the stability of Bose-Einstein condensates [2,3], and understand collisional shifts of atomic fountain frequency standards [4,5].…”

mentioning

confidence: 99%

Cold Collision Frequency Shift of the1S-2STransition in Hydrogen

et al. 1998

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We have observed the cold collision frequency shift of the 1S-2S transition in trapped spin-polarized atomic hydrogen. We find ∆ν 1S−2S = −3.8 ± 0.8 × 10 −10 n Hz cm 3 , where n is the sample density. From this we derive the 1S-2S s-wave triplet scattering length, a 1S−2S = −1.4 ± 0.3 nm, which is in fair agreement with a recent calculation. The shift provides a valuable probe of the distribution of densities in a trapped sample.

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Laser-cooled Cs frequency standard and a measurement of the frequency shift due to ultracold collisions

Cited by 246 publications

References 25 publications

Quantum-noise-limited interferometric measurement of atomic noise: Towards spin squeezing on the Cs clock transition

Quantum-noise-limited interferometric measurement of atomic noise: Towards spin squeezing on the Cs clock transition

Precision Feshbach spectroscopy of ultracoldCs2

Cold Collision Frequency Shift of the1S-2STransition in Hydrogen

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