Coherent states of alternating current

Phys. Rev. B 56, 6839 – Published 15 September 1997
D. A. Ivanov, H. W. Lee, and L. S. Levitov

Abstract

We study counting statistics of electric current pumped by pulses of an external field. The fluctuations depend on the pulse shape, and can be minimized by choosing the pulse shape properly. For an optimal pulse shape, the fluctuations are reduced to the dc level, i.e., they do not depend on the duty cycle of the signal. We develop an approach that allows us to calculate all counting statistics for various driving fields, optimal and nonoptimal. The statistics depend in an interesting way on the analytic structure of the field time dependence, and display an analogy with coherent states and instantons.

DOI: http://dx.doi.org/10.1103/PhysRevB.56.6839

  • Received 2 December 1996
  • Published in the issue dated 15 September 1997

© 1997 The American Physical Society

Authors & Affiliations

D. A. Ivanov

  • 12-127, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
  • L. D. Landau Institute for Theoretical Physics, Moscow 117940, Russia

H. W. Lee

  • Center for Theoretical Physics, Seoul National University, Seoul 151-742, Korea

L. S. Levitov

  • 12-112, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
  • L. D. Landau Institute for Theoretical Physics, Moscow 117940, Russia

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