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We report the theory of the \emph{dynamical response of current fluctuations}of a photo-excited conductor. We have performed the calculation for a coherentconductor described by arbitrary energy-dependent transmissions and forarbitrary frequencies. We consider two experimental setups that correspond todifferent ways of symmetrizing the current operators, leading to differentpredictions. Our results are in very good, quantitative agreement with a recentmeasurement. We demonstrate that the dynamical response of noise that we havecalculated is the key concept that relates Dynamical Coulomb Blockade, i.e. theelectron-electron correction to the conductance due to the presence of anexternal impedance, to quantum noise.

The Noise Susceptibility of a Photo-excited Coherent Conductor