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Q: Fachverband Quantenoptik und Photonik

Q 28: Quantum information: Atoms and ions IV

Q 28.2: Vortrag

Dienstag, 18. März 2014, 14:15–14:30, UDL HS3038

Interacting Rydberg atoms in arrays of optical tweezers — •Henning Labuhn, Sylvain Ravets, Lucas Béguin, Florence Nogrette, Daniel Barredo, Thierry Lahaye, and Antoine Browaeys — Institut d’Optique, Palaiseau, France

Controlling single neutral atoms in arrays of optical tweezers is a promising avenue for quantum science and technology [1,2]. Using a spatial light modulator (SLM), we demonstrate our ability to create traps separated by a few microns in controllable 2D geometries. We work in a regime where each trap contains only either zero or one atom. Using a two-photon excitation scheme, we coherently excite systems of two or three atoms into Rydberg states. The strong interaction between Rydberg atoms results in the observation of the characteristic Rydberg blockade effect. When the Rydberg excitation linewidth becomes comparable to the interaction, we observe a partial Rydberg blockade, where the populations in the excited states vary in time with different frequency components. Comparing the experimental measurements with a model based on the optical Bloch equations, we can determine the dipole-dipole interaction energy between the atoms [3]. We measure the evolution of the C₆ coefficient of the van der Waals interaction for different quantum numbers, as a function of the distance and the angle between the atoms.

[1] E. Urban et al., Nat. Phys. 5, 110-114 (2009)

[2] A. Gaëtan et al., Nat. Phys. 5, 115-118 (2009)

[3] L. Béguin et al., Phys. Rev. Lett. 110, 263201 (2013)