Long-lived Bloch oscillations with bosonic Sr atoms and application to gravity measurement at micrometer scale

Abstract

We report on the observation of Bloch oscillations on the unprecedented time scale of severalseconds. The experiment is carried out with ultra-cold bosonic strontium-88 loaded into a vertical optical standing wave. The negligible atom-atom elastic cross section and the absence of spin makes ${}^{88}$Sr an almost ideal Bose gas insensitive to typical mechanisms of decoherence due to thermalization and to external stray fields. The small size enables precision measurements of forces at micrometer scale. This is a challenge in physics for studies of surfaces, Casimir effects, and searches for deviations from Newtonian gravity predicted by theories beyond the standard model.

References in corpus (10)

• New Experimental Limits on Macroscopic Forces Below 100 Microns
• Atomic Interferometer with Amplitude Gratings of Light and its Applications to Atom Based Tests of the Equivalence Principle
• Measurement of the Casimir-Polder force through center-of-mass oscillations of a Bose-Einstein condensate
• A new determination of the fine structure constant based on Bloch oscillations of ultracold atoms in a vertical optical lattic
• New asymptotic behaviour of the surface-atom force out of thermal equilibrium
• Constraints on Yukawa-Type Deviations from Newtonian Gravity at 20 Microns
• Probing Sub-Micron Forces by Interferometry of Bose-Einstein Condensed Atoms
• Sensitive measurement of forces at micron scale using Bloch oscillations of ultracold atoms
• Cooling and trapping of ultra-cold strontium isotopic mixtures
• Cooling of Sr to high phase-space density by laser and sympathetic cooling in isotopic mixtures

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