Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 35: Poster 2
Q 35.22: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.I+II
Feedback control of atomic spin states in an optical cavity — •Miguel Martinez-Dorantes1, Stefan Brakhane1, Wolfgang Alt1, Tobias Kampschulte1, Rene Reimann1, Artur Widera1,2, and Dieter Meschede1 — 1Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn — 2Fachbereich Physik der TU Kaiserslautern, Erwin-Schrödinger-Str., 67663 Kaiserslautern
Detection and manipulation of atomic spin states is essential for many experimental realizations of quantum gates. Feedback schemes to stabilize the states and their superpositions can counteract perturbations caused by the environment.
In our experiment we deduce the atomic spin states of one and two Caesium atoms by measuring the transmission of a probe laser through a high-finesse cavity. A digital signal processor calculates time-dependent probabilities for the spin states in real-time utilizing a Bayesian update formalism [1]. Furthermore, we can use these probabilities for a feedback loop which allows us to experimentally create and stabilize any arbitrary mixture of atomic spin states inside the cavity.
S. Reick, K. Mølmer et al., J. Opt. Soc. Am. B 27, A152 (2010)