Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 7: Flying/Stationary Qubit Conversion and Entanglement Generation SYQR 1 (with Q)

A 7.6: Talk

Monday, March 17, 2014, 11:45–12:00, UDL HS2002

Fiber-Cavity Coupled Atomic Ensembles for Photon Storage — •Miguel Martinez-Dorantes, Wolfgang Alt, Jose Gallego, Sutapa Ghosh, Lucie Paulet, Lothar Ratschbacher, Yannik Völzke, and Dieter Meschede — Universität Bonn, Institut für Angewandte Physik, Wegelerstraße 8, 53115 Bonn

Quantum networks have the potential to revolutionize the area of information technology, where the unconditionally secure transmission of information represents a prominent application. The most advanced architectures for realizing long distance quantum links rely on stationary quantum network nodes that are communicating with each other via optical photons. Here, we are experimentally implementing such network node based on small ensembles of neutral atoms coupled to high-finesse optical resonators. The fiber coupled optical cavities are formed by microscopic mirrors that we fabricate at the end facet of optical fibers [1]. Collective interaction of multiple Rubidium atoms in such a small resonator mode can allow atom-photon interface operations with increased bandwidth and fidelities. In order to effective prepare small dense atomic ensembles we start by loading tens of Rubidium atoms from a small magneto optical trap into an optical dipole "conveyor belt". Raman-cooling and adiabatic compression techniques [2] are currently investigated to further compress the atom clouds before they will be transported into a 3D optical lattice created inside an optical resonator [3]. [1] D Hunger et al New J. Phys. 12 065038 (2010) [2] Marshall T. DePue, et al, PRL 82, 11 (1999). [3] Schrader, et al, App. Phys, B 73, 8 (2001)