Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 11: Quantum Information: Atoms and Ions 1
Q 11.4: Talk
Monday, March 14, 2011, 15:30–15:45, BAR Schön
Entanglement Distribution with an Atom-Cavity-System — •Carolin Hahn, Martin Mücke, Jörg Bochmann, Andreas Neuzner, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching
The deterministic generation and distribution of entanglement is one of the key ingredients for applications in quantum information science. In our system, a single Rubidium atom is quasi-permanently trapped inside a high-finesse optical cavity. Using this atom and a suitable energy-level scheme to produce a single photon entangles the polarization state of the emitted photon with the Zeeman-state of the atom. After a chosen time Δτ, the atomic state is mapped onto the polarization of a second photon, thus generating a maximally entangled photon pair. Technical improvements have increased the entanglement lifetime of our Zeeman qubit by more than one order of magnitude, now exceeding Δ τ = 150µs. So far, these experiments have been studied on the 87Rb D2-line at 780 nm. However, the prospect of interfacing our system e.g. with atomic systems, poses a strong incentive to implement a similar scheme on the D1-line at 795 nm. In addition, the involved excited state provides a much cleaner level scheme and therefore allows for higher fidelities with the desired entangled state. We report on the extension of the protocol to the D1-line. A detailed comparison of the system’s performance with respect to fidelity and photon generation efficiency at the two different wavelengths will be given and future applications will be discussed.