# Stuttgart 2012 – wissenschaftliches Programm

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# A: Fachverband Atomphysik

## A 20: SYRA 2: Ultracold Rydberg Atoms and Molecules 2

### A 20.2: Hauptvortrag

### Dienstag, 13. März 2012, 14:30–15:00, V47.01

**Quantum Information Processing with Rydberg Atoms** — •Philippe Grangier — Institut d'Optique, RD128, 91127 Palaiseau, France

We will present an overview of the use of direct interactions between trapped cold Rydberg states for quantum information processing.

A first approach is to use dipole blockade between individually trapped atoms, used as quantum bits. This allows one to generate entangled pairs of of atomic qubits, and to perform quantum gates, as it has been demonstrated by several recent experiments that will be presented.

A second approach is to use atomic ensembles, and to excite Rydberg polaritons in order to generate "giant" optical non-linear effects, that may lead to quantum gates for photonic qubits. Perspectives in that direction will be also discussed.