Measurement of high order current correlators

Details Measurement of high order current correlators Measurement of high order current correlators

2009-06-02

arxiv.org/abs/0906.0533v1

JETP 106, p. 117 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

27 pages

Scientific paper

10.1134/S1063776108010093

The feasibility of measuring high-order current correlators by means of a linear detector is analyzed. Two different types of measurements are considered: measurement of fluctuation power spectrum and measurement of unequal-time current correlators at fixed points in time. In both cases, formally exact expressions in terms of Keldysh time-ordered electron current operators are derived for the detector output. An explicit time ordering is found for the current correlators under the expectation operator used in measurements of high order unequal-time current correlators. The situation when a detector measures current correlators at different points of a conductor is considered.

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