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American Physical Society, Physical Review Letters, 21(106)

DOI: 10.1103/physrevlett.106.213002

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Laser controlled tunneling in a vertical optical lattice

Journal article published in 2011 by Quentin Beaufils, Gunnar Tackmann, Xiaolong Wang, Bruno Pelle, Sophie Pelisson, Peter Wolf, F. Pereira dos Santos, Franck Pereira Dos Santos ORCID
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Raman laser pulses are used to induce coherent tunnelling between neighbouring sites of a vertical 1D optical lattice. Such tunneling occurs when the detuning of a probe laser from the atomic transition frequency matches multiples of the Bloch frequency, allowing for a spectroscopic control of the coupling between Wannier Stark (WS) states. In particular, we prepare coherent superpositions of WS states of adjacent sites, and investigate the coherence time of these superpositions by realizing a spatial interferometer. This scheme provides a powerful tool for coherent manipulation of external degrees of freedom of cold atoms, which is a key issue for quantum information processing.