Abstract
We present analytical results for the leading (weak-localization) quantum interference correction to the shot-noise power in a ballistic chaotic cavity coupled nonideally to two electron reservoirs via leads with an arbitrary number of open scattering channels. The calculations were performed using two independent methods: $S$-matrix diagrammatic perturbation theory and quantum circuit theory. We obtained an unexpected amplification-suppression transition as a function of both the number of open channels and the barriers' transparencies. The effect results from a subtle combination of temporal and spatial quantum coherence in the electron propagation through the system.
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