An echo experiment in a strongly interacting Rydberg gas

Details An echo experiment in a strongly interacting Rydberg gas An echo experiment in a strongly interacting Rydberg gas

2007-06-26

arxiv.org/abs/0706.3869v2

Phys. Rev. Lett. 100, p. 013002 (2008)

Physics

Quantum Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.100.013002

When ground state atoms are excited to a Rydberg state, van der Waals interactions among them can lead to a strong suppression of the excitation. Despite the strong interactions the evolution can still be reversed by a simple phase shift in the excitation laser field. We experimentally prove the coherence of the excitation in the strong blockade regime by applying an `optical rotary echo' technique to a sample of magnetically trapped ultracold atoms, analogous to a method known from nuclear magnetic resonance. We additionally measured the dephasing time due to the interaction between the Rydberg atoms.

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