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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster Quanteneffekte

Q 29.15: Poster

Dienstag, 11. März 2008, 16:30–19:00, Poster C2

Adaptive quantum estimation of continuous systems — •Sabine Wölk and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany

We propose an adaptive scheme to reconstruct unknown quantum states of light via quantum comparison with certain classes of reference or ruler states. This comparison is realized by joint measurements of EPR variables on both states. The arising probability distribution contains the complete information of the unknown quantum state. Different ruler states allow us to estimate different representations of the unknown state. As an example, we have developed an adaptive algorithm to determine the quadrature representation using Gaussian states as ruler states.