Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Poster Quanteninformation

Q 34.3: Poster

Tuesday, March 20, 2007, 16:30–18:30, Poster C

Quantum optical measurements with nonclassical ruler states — •Sabine Wölk, Michael Busshardt, and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany

We propose a generalized scheme to measure a quantum state via quantum comparison of the unknown state with certain classes of ruler states. This comparison is realized via joint measurements of commuting observables on both states. Such measurements can be done in the optical domain. The arising probability distribution contains the complete information on the unknown quantum state. With the help of suitable ruler states, for example the Wigner function can be reconstructed. In the case of other ruler states a simple algorithm can be applied to reconstruct the Fock coefficients of the unknown state. This approach can be particularly suitable to estimate few-photon states.