Düsseldorf 2007 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 6: Quanteninformation (Photonen und nichtklassisches Licht II)
Q 6.4: Talk
Monday, March 19, 2007, 14:45–15:00, 5L
Remote Preparation of an Atomic Quantum Memory — •Wenjamin Rosenfeld1, Jürgen Volz1, Florian Henkel1, Stefan Berner1, Michael Krug1, Fredrik Hocke1, Markus Weber1, and Harald Weinfurter1,2 — 1Dept. für Physik der LMU, 80799 München — 2Max-Planck Institut für Quantenoptik, 85748 Garching
Entanglement is a key element of quantum information and communication applications. Of special interest is entanglement between different quantum objects like photons and atoms. It allows to combine the advantages of long atomic coherence times with the ability of photons to transport quantum information over large distances. Therefore atom-photon entanglement forms the basic ingredient for future applications, as e.g. quantum repeater and quantum networks.
In our experiment we generate entanglement between the spin of a single optically trapped Rb87 atom and the polarization of a photon in a spontaneous decay process in a lambda-type transition[1]. Based on this entanglement we performed a first demonstration of a quantum communication protocol between an atomic qubit and a photonic communication channel[2]. In this so-called remote state preparation we utilize the idea of quantum teleportation to transfer an arbitrary quantum state of the single photon to the atomic qubit. Together with a high-fideliy read-out procedure of the atomic state, this is a major building block for the faithful distribution of quantum information.
[1] J. Volz et al., PRL 96, 030404 (2006)
[2] W. Rosenfeld et al., quant-ph/0608229 (2006)