Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster 2: Intersectional Session

Q 23.5: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

Estimating mixed qudits: hedging and adaption — •Christof Happ, Florian Nägele, and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm

Reconstruction of a completely unknown quantum state from limited resources, i. e. when only a small number of identically prepared states are available, is an important challenge in the field of quantum information. We present Monte-Carlo simulations of estimation processes for mixed qubits and qudits (d-level states), that compare different estimation methods, namely standard maximum likelihood estimation and a modification of it, the so called hedged maximum likelihood estimation. The latter promises better estimation quality for mixed states. Additionally, we discuss adaptive methods to further improve estimation quality for this estimation schemes.