Projective versus weak measurement of charge in a mesoscopic conductor

D. Oehri, A. V. Lebedev, G. B. Lesovik, and G. Blatter
Phys. Rev. B 90, 075312 – Published 28 August 2014

Abstract

We study the charge dynamics of a quantum dot as measured by a nearby quantum point contact probing the dot via individual single-particle wave packets. We contrast the two limiting cases of weak and strong system-detector coupling exerting vanishing and strong backaction on the system and analyze the resulting differences in the charge-charge correlator. Extending the study to multiple projective measurements modeling a continuous strong measurement, we identify a transition from a charge dynamics dominated by the system's properties to a universal dynamics governed by the measurement.

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  • Received 18 June 2014
  • Revised 7 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.075312

©2014 American Physical Society

Authors & Affiliations

D. Oehri1, A. V. Lebedev1, G. B. Lesovik2, and G. Blatter1

  • 1Theoretische Physik, ETH Zurich, CH-8093 Zurich, Switzerland
  • 2L. D. Landau Institute for Theoretical Physics RAS, Akad. Semenova av., 1-A, Chernogolovka, 142432 Moscow Region, Russia

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Issue

Vol. 90, Iss. 7 — 15 August 2014

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