- 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.