Leggett-Garg inequality with a kicked quantum pump
Leggett-Garg inequality with a kicked quantum pump
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DOI：
10.1103/physrevlett.97.026805
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发表时间：
2006-07-14
影响因子：
8.6
通讯作者：
Buettiker, Markus
中科院分区：
文献类型：
--
作者：
Jordan, Andrew N.;Korotkov, Alexander N.;Buettiker, Markus
引入了踢量子非破坏测量，其中通过泵浦电流弱测量量子位。测量统计数据是针对弱测量与单量子位酉运算相结合得出的。这些结果被用来违反 Leggett-Garg 不等式的概括。这种违反与非侵入式探测器假设的失败有关，并且可以解释为固有探测器反作用，或者量子位纠缠微观探测器激励。结果通过脉冲发生器激发的量子点接触来讨论，测量双量子点。
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.