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Q: Fachverband Quantenoptik und Photonik

Q 41: Quanteninformation: Atome und Ionen 1

Q 41.1: Gruppenbericht

Donnerstag, 15. März 2012, 10:30–11:00, V7.02

An Elementary Quantum Network of Single Atoms in Optical Cavities — •Stephan Ritter, Christian Nölleke, Carolin Hahn, Andreas Reiserer, Andreas Neuzner, Manuel Uphoff, Martin Mücke, Eden Figueroa, Jörg Bochmann, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany

Quantum networks form the basis of distributed quantum computing architectures and quantum communication. Single atoms in optical cavities are ideally suited as universal quantum network nodes capable of sending, storing and retrieving quantum information. We demonstrate this by presenting an elementary version of a quantum network based on two identical nodes in remote, independent laboratories. The reversible exchange of quantum information and the creation of remote entanglement are achieved by exchange of a single photon. The dynamic control of coherent dark states allows for the generation of a single photon in one system, which we subsequently store at the other node. This process is used to coherently transfer arbitrary quantum states. We show how to create maximally entangled Bell states of the two atoms at distant nodes and characterize their fidelity and lifetime. The resulting nonlocal state is manipulated via unitary operations applied locally at one of the nodes. This cavity-based approach to quantum networking allows for the reversible exchange of quantum information and offers a clear perspective for scalability.