Weak Values and the Leggett-Garg Inequality in Solid-State Qubits
Abstract
An implementation of weak values is investigated in solid-state qubits. We demonstrate that a weak value can be nonclassical if and only if a Leggett-Garg inequality can also be violated. Generalized weak values are described in which post-selection occurs on a range of weak measurement results. Imposing classical weak values permits the derivation of Leggett-Garg inequalities for bounded operators. Our analysis is presented in terms of kicked quantum nondemolition measurements on a quantum double-dot charge qubit.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 2008
- DOI:
- 10.1103/PhysRevLett.100.026804
- arXiv:
- arXiv:0707.3427
- Bibcode:
- 2008PhRvL.100b6804W
- Keywords:
-
- 73.23.-b;
- 03.65.Ta;
- 03.67.Lx;
- Electronic transport in mesoscopic systems;
- Foundations of quantum mechanics;
- measurement theory;
- Quantum computation;
- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect;
- Quantum Physics
- E-Print:
- 4 pages, 2 figures