Leggett-Garg Inequality with a Kicked Quantum Pump

Andrew N. Jordan, Alexander N. Korotkov, and Markus Büttiker
Phys. Rev. Lett. 97, 026805 – Published 14 July 2006

Abstract

A kicked quantum nondemolition measurement is introduced, where a qubit is weakly measured by pumping current. Measurement statistics are derived for weak measurements combined with single-qubit unitary operations. These results are applied to violate a generalization of the Leggett-Garg inequality. The violation is related to the failure of the noninvasive detector assumption, and may be interpreted as either intrinsic detector backaction, or the qubit entangling the microscopic detector excitations. The results are discussed in terms of a quantum point contact kicked by a pulse generator, measuring a double quantum dot.

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  • Received 28 October 2005

DOI:https://doi.org/10.1103/PhysRevLett.97.026805

©2006 American Physical Society

Authors & Affiliations

Andrew N. Jordan1,2, Alexander N. Korotkov3, and Markus Büttiker2

  • 1Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
  • 2Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland
  • 3Department of Electrical Engineering, University of California, Riverside, California 92521-0204, USA

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Issue

Vol. 97, Iss. 2 — 14 July 2006

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