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Phys Rev Lett. 2006 Jul 14;97(2):026805. Epub 2006 Jul 14.

Leggett-Garg inequality with a kicked quantum pump.

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Department of Physics and Astronomy, University of Rochester, New York 14627, USA.


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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