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Abstract
We report on high-resolution optical spectroscopy of interacting bosonic 174Yb atoms in deep optical lattices with negligible tunneling. We prepare Mott insulator phases with singly- and doubly-occupied isolated sites and probe the atoms using an ultra-narrow ‘clock’ transition. Atoms in singly-occupied sites undergo long-lived Rabi oscillations. Atoms in doubly-occupied sites are strongly affected by interatomic interactions, and we measure their inelastic decay rates and energy shifts. We deduce from these measurements all relevant collisional parameters involving both clock states, in particular the intra- and inter-state scattering lengths.
Highlights
In the last decade, progress in laser frequency stabilization and frequency comparison has led to a new generation of atomic clocks with unprecedented performances [1]
While atomic interactions are usually detrimental in frequency metrology [1], degenerate quantum gases may help to improve the accuracy of optical clocks by offering a better control over interaction effects [1], as suggested by a recent demonstration with a degenerate Fermi gas of 87Sr [14]
In order to evaluate the impact of such frequency fluctuations on the coherent dynamics in Fig. 1b, we modeled them by a random detuning δ with a Gaussian distribution function of width ∆ωcl
Summary
Progress in laser frequency stabilization and frequency comparison has led to a new generation of atomic clocks with unprecedented performances [1] These clocks use ultra-narrow 1S0 → 3P0 optical transitions (hereafter “clock” transitions), interrogated with ultra-stable lasers locked to high-finesse Fabry-Perot cavities. Bose-Einstein condensation in hydrogen was detected through the associated change in the optical spectrum recorded on the 1S − 2S transition [16] This early study pointed out the role of intra- and inter-state interactions on the shape and position of the optical spectra. After a fast initial decay of the total atom number, the contrast of the oscillations approaches unity and eventually decreases for t 8 ms
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