2015
DOI: 10.1103/physreva.92.012106
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Stability of a trapped-atom clock on a chip

Abstract: We present a compact atomic clock interrogating ultracold 87 Rb 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 7 noise sources explains the measured frequency stability. Fluctuations in the atom temperature (0.4 nK… Show more

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Cited by 48 publications
(55 citation statements)
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“…To estimate the effective nonlinearity for the different choices of the scattering lengths, we calculated the parameter χ of the one-axis twisting Hamiltonian at the stationary state in our geometry. We obtain χ=7.5×10 −5 s 1 with the scattering length values from [32] (red curve), χ=7.3×10 −5 s 1 with the values from [20] (green curve), and 24.6 10 s 5 1 c =´-for the combination [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] (blue curve).…”
Section: Simulation Resultsmentioning
confidence: 99%
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“…To estimate the effective nonlinearity for the different choices of the scattering lengths, we calculated the parameter χ of the one-axis twisting Hamiltonian at the stationary state in our geometry. We obtain χ=7.5×10 −5 s 1 with the scattering length values from [32] (red curve), χ=7.3×10 −5 s 1 with the values from [20] (green curve), and 24.6 10 s 5 1 c =´-for the combination [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] (blue curve).…”
Section: Simulation Resultsmentioning
confidence: 99%
“…We use the 1 2 ñ « ñ | | clock transition, which enables first-order cancellation of spatial inhomogeneity of the transition frequency in a magnetic trap [21,28]. The transition is driven by a two-photon, RF and MW pulse [22] with Rabi frequency Ω=2π×3.6 Hz. This Rabi frequency, which leads to a pulse duration longer than the vertical trap oscillation period, guarantees that field inhomogeneity from the on-chip microwave guide is averaged out [22].…”
Section: Methodsmentioning
confidence: 99%
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“…8 Atoms trapped above the surface, so-called atom chips, [9][10][11] are now used as the basis for many experiments, such as atom interferometry, 12 atomic sensors, 13 and atomic clocks. 14 There are two main kinds of manipulation technique: magnetic and optical. Magnetic fields above the surface can be produced either by currentcarrying wires or patterned magnetic materials and are used to reflect or trap atoms in low-fieldseeking states, 15 as well as to induce velocity-selective magnetic transitions at the surface.…”
Section: Introductionmentioning
confidence: 99%