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We present a formalism to calculate finite-frequency current correlations ininteracting nanoscale conductors. We work within the n-resolved density matrixapproach and obtain a multi-time cumulant generating function that provides thefluctuation statistics, solely from the spectral decomposition of theLiouvillian. We apply the method to the frequency-dependent third cumulant ofthe current through a single resonant level and through a double quantum dot.Our results, which show that deviations from Poissonian behaviour stronglydepend on frequency, demonstrate the importance of finite-frequencyhigher-order cumulants in fully characterizing interactions.Comment: 4 pages, 2 figures, improved figures & discussion. J-ref adde

Frequency-dependent counting statistics in interacting nanoscale conductors