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Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 16: Quantum Gases: Interaction Effects I

Q 16.2: Vortrag

Dienstag, 9. März 2010, 14:30–14:45, E 001

Atom chip based generation of entanglement for quantum metrology — •Max Fabian Riedel1,2, Pascal Böhi1,2, Yun Li3,4, Theodor Wolfgang Hänsch1,2, Alice Sinatra3, and Philipp Treutlein1,21Ludwig-Maximilians-Universität, 80799 München, Germany — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 3Laboratoire Kastler-Brossel, ENS, 75005 Paris, France — 4State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

Entanglement-based technologies, such as quantum information processing, quantum simulations, and quantum metrology have the potential to revolutionize our way of computing and measuring, and help clarify the puzzling concept of entanglement itself. Ultracold atoms on atom chips are attractive for their implementation, as they provide control over quantum systems in compact, robust, and scalable setups. A severe limitation of atom chips, however, is that techniques to control atomic interactions and thus to generate entanglement have not been experimentally available so far.

In this talk we present experiments where we generate multi-particle entanglement on an atom chip by controlling elastic collisional interactions with a state-dependent microwave near-field potential. We employ this technique to generate spin-squeezed states of a two-component Bose-Einstein condensate and show that they are useful for quantum metrology. Our data show good agreement with a dynamical multi-mode simulation and allow us to reconstruct the Wigner function of the spin-squeezed condensate.

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