Leggett-Garg inequality with a kicked quantum pump
Andrew N. Jordan, Alexander N. Korotkov, and Markus Buttiker
Phys. Rev. Lett. 97, 026805 (2006)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.
|
University of Rochester Department of Physics & Astronomy Bausch & Lomb Hall P.O. Box 270171 500 Wilson Boulevard Rochester, NY 14627-0171 |
|
HOME INDEX SEARCH | ||
|
This page was last updated Mon, Nov 23, 2009;
10:35:29 AM Comments? Contact webmaster@pas.rochester.edu |
||||