Control of Interaction-Induced Dephasing of Bloch Oscillations

Abstract

We report on the control of interaction-induced dephasing of Bloch oscillations for an atomic Bose-Einstein condensate in an optical lattice under the influence of gravity. When tuning the strength of the interaction towards zero by means of a Feshbach resonance, the dephasing time is increased from a few to more than twenty thousand Bloch oscillation periods. We quantify the dephasing in terms of the width of the quasi-momentum distribution and measure its dependence on time for different values of the scattering length. Minimizing the dephasing allows us to realize a BEC-based atom interferometer in the non-interacting limit. We use it for a precise determination of a zero-crossing for the atomic scattering length and to observe collapse and revivals of Bloch oscillations when the atomic sample is subject to a spatial force gradient.

4 pages, 5 figures

References in corpus (5)

• Long-lived Bloch oscillations with bosonic Sr atoms and application to gravity measurement at micrometer scale
• Atom interferometry with a weakly-interacting Bose Einstein condensate
• ${}^{87}$Sr lattice clock with inaccuracy below 10${}^{-15}$
• Bloch oscillations of ultracold atoms: a tool for a metrological determination of $h/m_{Rb}$
• Optimized production of a cesium Bose-Einstein condensate

Cited by in corpus (21)

• Atom Interferometers
• Atom interferometry with a weakly-interacting Bose Einstein condensate
• Combination of Bloch oscillations with a Ramsey-Bordé interferometer : new determination of the fine structure constant
• Magnetic dipolar interaction in an atomic Bose Einstein condensate interferometer
• Diffraction-managed solitons and nonlinear beam diffusion in modulated arrays of optical waveguides
• A quantum sensor for atom-surface interactions below 10 $\mu$m
• ac-driven atomic quantum motor
• Stable Bloch oscillations of cold atoms with time-dependent interaction
• Paired atom laser beams created via four-wave mixing
• Andreev reflection in bosonic condensates
• A Feshbach resonance in d-wave collisions
• Atom interferometry based on light pulses : application to the high precision measurement of the ratio h/m and the determination of the fine structure constant
• Magnetic trapping of a cold Rb-Cs atomic mixture
• Damped Bloch Oscillations of Bose-Einstein Condensates in Disordered Potential Gradients
• Power-law behavior in the quantum-resonant evolution of the delta-kicked accelerator
• Ultra cold atoms and Bose-Einstein condensation for quantum metrology
• Fractional resonances in the atom-optical delta-kicked accelerator
• Precise determination of h/m_Rb using Bloch oscillations and atomic interferometry: a mean to deduce the fine structure constant
• Quantum noise thermometry for bosonic Josephson junctions in the mean field regime
• In situ Ramsey Interferometry and Diffraction Echo with an Ultracold Fermi Gas
• Bose-Einstein condensates in disordered potentials