Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Quanteninformation (Konzepte II)
Q 41.2: Vortrag
Mittwoch, 21. März 2007, 14:15–14:30, 5L
Practical Scheme for Noiseless Filtering of Continuous-Variable Information with Non-Gaussian Noise — •Christoffer Wittmann1, Dominique Elser1, Ulrik L. Andersen1, Radim Filip2, Petr Marek2, and Gerd Leuchs1 — 1Institut für Optik, Information und Photonik, Max-Planck Forschungsgruppe, Universität Erlangen-Nürnberg, — 2Department of Optics, Palacký University,
Every practical quantum channel degrades the quality of quantum states transmitted between two parties. In order to establish a communication with a low error rate, it is therefore important to determine and, if possible, to decrease the influence of noise in the quantum channel. We investigate an optical quantum channel with non-Gaussian noise characteristics, which transforms a signal state into a statistical mixture of signal and vacuum.
We propose and experimentally demonstrate a new scheme for a noiseless and optimal quantum filter or quantum relay filtering vacuum states from this mixture. Two different filters were implemented; one which is relying on weak homodyne measurements and one on weak on/off measurements. The performance of the two schemes is compared relative to the optimal scheme.