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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2015

Stability of a trapped-atom clock on a chip

Résumé

We present a compact atomic clock interrogating ultracold 87Rb magnetically trapped on an atom chip. Very long coherence times sustained by spin self-rephasing allow us to interrogate the atomic transition with 85% contrast at 5-s Ramsey time. The clock exhibits a fractional frequency stability of 5.8 ×10-13 at 1 s and is likely to integrate into the 10-15 range in less than a day. A detailed analysis of seven noise sources explains the measured frequency stability. Fluctuations in the atom temperature (0.4 nK shot-to-shot) and in the offset magnetic field (5 ×10-6 relative fluctuations shot-to-shot) are the main noise sources together with the local oscillator, which is degraded by the 30% duty cycle. The analysis suggests technical improvements to be implemented in a future second generation setup . The results demonstrate the remarkable degree of technical control that can be reached in an atom chip experiment.

Dates et versions

hal-02449062 , version 1 (22-01-2020)

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R. Szmuk, V. Dugrain, W. Maineult, J. Reichel, P. Rosenbusch. Stability of a trapped-atom clock on a chip. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2015, 92 (1), pp.012106. ⟨10.1103/PhysRevA.92.012106⟩. ⟨hal-02449062⟩
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