Time ordering and counting statistics

Details Time ordering and counting statistics Time ordering and counting statistics

2009-07-22

arxiv.org/abs/0907.3848v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages, 1 figure; inconsequential mistake and typos corrected

Scientific paper

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.

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