Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 26: Quantum Information: Concepts and Methods IV

Q 26.5: Vortrag

Dienstag, 24. März 2015, 15:30–15:45, K/HS1

Verifying the metrological usefulness of Dicke states with collective measurements — •Iagoba Apellaniz1, Bernd Lücke2, Carsten Klempt2, and Géza Tóth1,3,41Department of Theoretical Physics, University of the Basque Country UPV/EHU, P.O. Box 644, E-48080 Bilbao, Spain — 2Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany — 3IKERBASQUE, Basque Foundation for Science, E-48013 Bilbao, Spain — 4Wigner Research Centre for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary

We present a method that can verify the metrological usefulness of noisy Dicke states with few collective measurements. Our method proves the usefulness of the state for estimating the angle of rotation when the Dicke state is in a homogenous magnetic field.

We assume that after the rotation a collective operator is measured to estimate the angle, which is the most relevant case in practice for many-particle systems. We apply our method to recent experimental results with Dicke states.

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