Hannover 2010 – wissenschaftliches Programm

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SYSA: Symposium Single Atoms

SYSA 2: Single Atoms II

SYSA 2.2: Hauptvortrag

Donnerstag, 11. März 2010, 14:30–15:00, A 320

Entanglement of two individual neutral atoms using Rydberg blockade — •Tatjana Wilk, Alpha Gaëtan, Charles Evellin, Janik Wolters, Yevhen Miroshnychenko, Philippe Grangier, and Antoine Browaeys — Institut d’Optique, Campus Polytechnique - RD128, 91127 Palaiseau cedex, France

The interaction between atoms in Rydberg states is enhanced by many orders of magnitude compared to ground state atoms. This effect can be used to turn on and off the interaction between single atoms at distances on the order of micrometers. In particular the simultaneous excitation of more than one atom to a Rydberg state is strongly suppressed. A decade ago this so-called Rydberg blockade effect was proposed for the implementation of fast quantum gates for neutral atoms and for the creation of entanglement between them [1]. Only recently two experiments have demonstrated the realization of such schemes [2]. Here, we report on our work of the generation of entanglement between two individual ⁸⁷Rb atoms in hyperfine ground states |F=1, m_F=1⟩ and |F=2, m_F=2⟩ which are held in two optical tweezers separated by 4 µm. The entangled state is generated in about 200 ns using pulsed two-photon excitation. We quantify the entanglement by applying global Raman rotations on both atoms. [1] D. Jaksch et al., Phys. Rev. Lett. 85, 2208 (2000). M.D. Lukin et al., Phys. Rev. Lett. 87, 037901 (2001). [2] L. Isenhower et al., arXiv: 0907.5552 (2009). T. Wilk et al., arXiv: 0908.0454 (2009).