Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Quanteninformation (Ionen)
Q 7.3: Vortrag
Montag, 19. März 2007, 15:30–15:45, 5L
Generation of Dicke States in Distant Qubits Using Linear Optics — •Christoph Thiel1, Joachim von Zanthier1, Thierry Bastin2, Enrique Solano3, and Girish S. Agarwal4 — 1Institut für Optik, Information und Photonik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — 2Institut de Physique Nucléaire, Atomique et de Spectroscopie, Université de Liège au Sart Tilman, Liège, Belgium — 3Physics Department, ASC, and CeNS, Ludwig-Maximilians-Universität, Munich, Germany — 4Department of Physics, Oklahoma State University, Stillwater, OK, USA
We propose a method for generating symmetric Dicke states (like e.g. W states) of distant particles. Unlike former proposals, ours is capable of producing Dicke states of an arbitrary number of particles based on linear optics and photodetection.
In particular, we consider a chain of stored ions in a Paul trap or, equivalently, a chain of neutral trapped atoms, where each of them is driven in a Λ-configuration. All atoms are initially excited into the upper state and the spontaneously emitted photons are recorded by single photodetectors. In front of each detector a polarization analyzer determines the polarization state of the registered photon. We show that for generating a particular Dicke state there exists, at least, one suitably designed geometry of non-local detection events that will enforce that particular outcome in the long-lived atomic state.
The proposed probabilistic scheme does not require auxiliary systems like the use of collective motional degrees of freedom, or single cavity modes, and is feasible with current technology.