Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Quanteneffekte (Verschränkung und Dekohärenz)
Q 38.6: Talk
Thursday, March 13, 2008, 12:30–12:45, 2D
Generation of arbitrary Dicke states in remote qubits using linear optics — •Andreas Maser1, Christoph Thiel1, Uwe Schilling1, Thierry Bastin2, Enrique Solano3, and Joachim von Zanthier1 — 1Institut für Optik, Information und Photonik, Max- Planck-Forschungsgruppe, Universität Erlangen-Nürnberg, Germany — 2Institut de Physique Nucléaire, Atomique et de Spectroscopie, Université de Liège, Belgium — 3Physics department, ASC, and CeNS, Ludwig-Maximilians-Universität, Munich, Germany
We propose a method for generating any state out of the whole family of Dicke states (symmetric and non-symmetric) for an arbitrary number of remote qubits: The method uses the long-lived internal ground levels of remote particles as qubits and is based on linear optics and single photon detection. The scheme offers thus access to the complete basis of the Hilbert space of an N spin-1/2 particle compound system and its not yet investigated entanglement classes.
In particular, we consider a system of N localized atoms, e.g. ions stored in a Paul trap, where each of them is characterised by a Λ-configuration. All atoms are initially coherently excited into the upper state and the spontaneously emitted photons are collected by photonic fibres which are connected to photon detectors with polarization sensitive analyzers placed in front. The latter determine the polarization state of the registered photons.