Coherent transport in driven optical lattices – Niels Bohr Institute - University of Copenhagen

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Coherent transport in driven optical lattices

We present a dynamical control of transport of ultra-cold 88Sr atoms loaded in a driven optical lattice. By introducing a modulation of an accelerated lattice potential we induce a controlled coupling between Wannier-Stark states located on different lattice sites. This coupling gives rise to coherent resonant delocalization when the modulation frequency matches the energy separation between adjacent sites, namely the Bloch frequency. We apply this mechanism to engineer a coherent transport over macroscopic distances, and we demonstrate one realization of Loschmidt echos. On the other hand, the same transport mechanism can be applied to microscopic scale to measure forces with high spatial resolution and ppm sensitivity.