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Microwave fidelity studies by varying antenna coupling
B Köber1, U Kuhl, H-J Stöckmann
1Fachbereich Physik der Philipps-Universität Marburg, D-35032 Marburg, Germany.
Abstract:
The fidelity decay in a microwave billiard is considered, where the coupling to an attached antenna is varied. The resulting quantity, coupling fidelity, is experimentally studied for three different terminators of the varied antenna: a hard-wall reflection, an open wall reflection, and a 50 Ω load, corresponding to a totally open channel. The model description in terms of an effective Hamiltonian with a complex coupling constant is given. Quantitative agreement is found with the theory obtained from a modified VWZ approach [J. J. M. Verbaarschot, Phys. Rep. 129, 367 (1985)].
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