09-117 S. Bachmann, G.M. Graf, G.B. Lesovik

Time ordering and counting statistics (63K, Latex with 1 PS figure) Jul 22, 09

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Abstract. The basic quantum mechanical relation between fluctuations of transported charge and current correlators is discussed. It is found that, as a rule, the correlators are to be time-ordered in an unusual way. Instances where the difference with the conventional ordering matters are illustrated by means of a simple scattering model. We apply the results to resolve a discrepancy concerning the third cumulant of charge transport across a quantum point contact.

Files: 09-117.src( 09-117.keywords , New_Pump.pstex_t , TimeOrdering_5.tex , New_Pump.pstex )