Frankfurt 2006 – scientific programme
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Q: Quantenoptik und Photonik
Q 76: Poster Quantenkommunikation
Q 76.3: Poster
Thursday, March 16, 2006, 16:30–18:30, Labsaal
Experimental Quantum State Distillation: comparison between single photon and homodyne detection — •Dominique Elser1, Christoffer Wittmann1, Stefan Lorenz1, Radim Filip1,2, Ulrik L. Andersen1, and Gerd Leuchs1 — 1Institute of Optics, Information and Photonics (Max Planck Research Group), University of Erlangen-Nuremberg, Günther-Scharowsky-Str. 1, Building 24, 91058 Erlangen, Germany — 2Department of Optics, Research Center for Optics, Palacky University, 17. Listopadu 50, 77200 Olomouc, Czech Republic
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 transforming a signal state into a statistical mixture of signal and vacuum. The task of the distillation process is to recover the pure signal state. A possible application of this device is a quantum relay.
In this contribution we compare the distillation performance of single photon detection and homodyne measurement. After coherent signal states have passed through a noisy channel, a part of the beam is tapped off and measured in the distillation device. The information obtained hereby is used to condition further measurements of the signal.