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Scientific article
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English

Leggett-Garg inequality with a kicked quantum pump

Published inPhysical review letters, vol. 97, no. 026805, 4
Publication date2006
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.

Keywords
  • Mesoscopic systems and quantum hall effect
  • Condensed matter
Citation (ISO format)
JORDAN, Andrew N., BUTTIKER, Markus, KOROTKOV, Alexander N. Leggett-Garg inequality with a kicked quantum pump. In: Physical review letters, 2006, vol. 97, n° 026805, p. 4. doi: 10.1103/PhysRevLett.97.026805
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ISSN of the journal0031-9007
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