Journal of Statistical Physics

, Volume 138, Issue 1–3, pp 333–350 | Cite as

Time Ordering and Counting Statistics

  • S. Bachmann
  • G. M. Graf
  • G. B. Lesovik


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 tunnel junction.

Time ordering Correlation functions Counting statistics Contact terms Schwinger terms Transport theory 


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© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Theoretische PhysikETH ZürichZürichSwitzerland
  2. 2.L.D. Landau Institute for Theoretical Physics RASMoscowRussia

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