Measurement of high-order current correlators
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.
- Publication:
-
Soviet Journal of Experimental and Theoretical Physics
- Pub Date:
- January 2008
- DOI:
- 10.1134/S1063776108010093
- arXiv:
- arXiv:0906.0533
- Bibcode:
- 2008JETP..106..117B
- Keywords:
-
- 03.65.Ta;
- 05.40.-a;
- 05.60.Gg;
- 73.23.-b;
- 03.65.Ta;
- 05.40.-a;
- 05.60.Gg;
- 73.23.-b;
- Foundations of quantum mechanics;
- measurement theory;
- Fluctuation phenomena random processes noise and Brownian motion;
- Quantum transport;
- Electronic transport in mesoscopic systems;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 27 pages