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The fidelity decay in a microwave billiard is considered, where the coupling to an attached antenna is varied. The coupling fidelity is experimentally studied for three different terminators of the varied antenna: a hard wall reflection, an open wall reflection, and a 50 Ohm 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 [Verbaarschot et al., Phys. Rep. 129, 367 (1985)]. |
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