Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 58: Photonik 3
Q 58.3: Talk
Friday, March 16, 2012, 11:15–11:30, V38.01
Rydberg Blockade in a hot Vapor -- Optimal Control Approach towards a Single Photon Source — •Matthias Müller1, Simone Montangero1, Andreas Kölle2, Robert Löw2, Tilman Pfau2, and Tommaso Calarco1 — 1Universität Ulm — 2Universität Stuttgart
Rydberg Atoms are a promising approach to an implementation of quantum computational building blocks [Rev. Mod. Phys. 82, 2313-2363 (2010)]. Their long-range state-dependent interaction allows to establish entanglement over extended samples. One major concept is the usage of the so-called Rydberg blockade preventing multiple excitation of atoms inside a blockade sphere into the Rydberg state as the interaction potential moves doubly excited states out of resonance.
This effect can be used to create a W-state with one single excitation and an imprinted phase and thus an imprinted direction of the photon obtained by spontaneous collective emission of the W-state. A single photon source like this is a key element of quantum information transfer, also in the framework of quantum repeaters.
In my talk I will show how the implementation of this idea depends on optimal control theory and what improvement this technique yields.