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We report on the observation of Bloch oscillations on the unprecedented timescale of severalseconds. The experiment is carried out with ultra-cold bosonicstrontium-88 loaded into a vertical optical standing wave. The negligibleatom-atom elastic cross section and the absence of spin makes $^{88}$Sr analmost ideal Bose gas insensitive to typical mechanisms of decoherence due tothermalization and to external stray fields. The small size enables precisionmeasurements of forces at micrometer scale. This is a challenge in physics forstudies of surfaces, Casimir effects, and searches for deviations fromNewtonian gravity predicted by theories beyond the standard model

Long-Lived Bloch Oscillations with Bosonic Sr Atoms and Application to Gravity Measurement at the Micrometer Scale