Experimental investigation of microwave networks simulating quantum chaotic systems: the role of direct processes

Abstract

The influence of direct processes on the cross-correlation function c12(ν) and the elastic enhancement factor WS, β was studied experimentally using microwave networks in the presence of absorption. Microwave networks simulate quantum graphs with and without time-reversal symmetry. Direct processes exist because, for example, of non-perfect coupling between a studied system and a measuring device. We show that direct processes strongly influence the cross-correlation function c12(ν) in contrast to the enhancement factor WS, β, which is not sensitive to these processes. It makes the enhancement factor WS, β an important measure of the chaoticity of a quantum system.