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Q: Fachverband Quantenoptik und Photonik

Q 38: Quanteneffekte (Verschränkung und Dekohärenz)

Q 38.1: Gruppenbericht

Donnerstag, 13. März 2008, 11:00–11:30, 2D

Operational monitoring of multi-qubit entanglement classes via tuning of local operations — •Thierry Bastin¹, Christoph Thiel², Joachim von Zanthier², Lucas Lamata³, Enrique Solano⁴, and Girish S. Agarwal⁵ — ¹Institut de Physique Nucléaire, Atomique et de Spectroscopie, Université de Liège, Belgium — ²Institut für Optik, Information und Photonik,Max-Planck Forschungsgruppe, Universität Erlangen-Nürnberg, Germany — ³Max-Planck-Institut für Quantenoptik, Garching, Germany — ⁴Physics Department, ASC, and CeNS, Ludwig-Maximilians-Universität, Munich, Germany — ⁵Department of Physics, Oklahoma State University, Stillwater, USA

We introduce a physical setup consisting of N emitters, incoherently radiating single photons that may be absorbed remotely by detectors equipped with polarizers and producing long-lived multiqubit entangled states in the internal ground levels of the emitters. By using optical fibers our system offers also access to remote entangled matter qubit states.

We show that it is possible to associate well-defined sets of locally tuned polarizer orientations with multiqubit entanglement classes, allowing their monitoring in an operational manner. Our method is not restricted to two or three particles but can monitor entanglement classes even for a four particle system. Hereby, multipath quantum interference, associated with qubit permutation symmetry, plays a key role in explaining the underlying physics.