Leggett-Garg inequality with a kicked quantum pump

Details Leggett-Garg inequality with a kicked quantum pump Leggett-Garg inequality with a kicked quantum pump

2005-10-28

arxiv.org/abs/cond-mat/0510782v2

Phys. Rev. Lett. 97, 026805 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, published version

Scientific paper

10.1103/PhysRevLett.97.026805

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 Leggett and Garg's 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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