Hamburg 2009 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

Q: Fachverband Quantenoptik und Photonik

Q 2: Quanteninformation: Atome und Ionen I

Q 2.6: Talk

Monday, March 2, 2009, 12:00–12:15, ESA-B

Towards entanglement of two individual atoms using the Rydberg blockade — •Tatjana Wilk, Alpha Gaëtan, Yevhen Miroshnychenko, Charles Evellin, Antoine Browaeys, and Philippe Grangier — Laboratoire Charles Fabry, Institut d’Optique, Palaiseau, France

The Rydberg blockade is of great interest for many quantum information processing schemes, since it provides a way to deterministically entangle two or more atoms and to drive fast quantum gates [1]. First experimental efforts into this direction recently succeeded in the observation of the Rydberg blockade between two ⁸⁷Rb atoms individually trapped in two neighboring dipole traps [2,3]. Furthermore, in the two atom system the Rabi frequency for oscillations between the ground state |gg⟩ and one atom in the Rydberg state is enhanced by √2 with respect to the Rabi frequency for a single atom [3]. This indicates the production of an entangled state (|gr⟩+|rg⟩)/√2. To be able to quantify the entanglement between the two atoms in a Bell test or a state tomography, the Rydberg state is mapped onto another ground state |g′⟩. Rotations of the measurement basis are done with a pair of Raman lasers coupling |g⟩ and |g′⟩. The atomic state is read out observing the fluorescence of the remaining atoms after ejecting atoms in state |g⟩ from the trap. We report on the current status of the experiment. [1] D. Jaksch et al., Phys. Rev. Lett. 85, 2208 (2000). M.D. Lukin et al., Phys. Rev. Lett. 87, 037901 (2001). [2] E. Urban et al., arxiv:0805.0758. [3] A. Gaëtan et al., Nature Phys. (accepted, see also arxiv:0810.2960).