Berlin 2001 – scientific programme

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Q: Quantenoptik

Q 9: Poster: Quantum Information

Q 9.11: Poster

Tuesday, April 3, 2001, 12:30–15:00, AT2

Estimating quantum channels — •Dietmar G. Fischer, Holger Mack, Markus A. Cirone, and Matthias Freyberger — Abteilung für Quantenphysik, Universität Ulm

Quantum channels are a widely discussed topic in quantum information. However, mainly the properties of previously known quantum channels have been investigated yet. We look at the inverse problem: How can we determine a priori unknown quantum channels from finite resources? We present efficient schemes to estimate the parameters characterizing a quantum channel and discuss the role of the cost function and entanglement. It will turn out that entanglement can serve as an essential resource that leads to an improved estimation quality.

We acknowledge financial support by the Deutsche Forschungsgemeinschaft.