Measurement of high-order current correlators |
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Authors: | K V Bayandin A V Lebedev G B Lesovik |
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Institution: | (1) Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia;(2) Theoretische Physik, ETH Zürich, CH-8093 Zürich, Switzerland |
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Abstract: | 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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