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Phys Rev Lett. 2008 Jan 18;100(2):026804. Epub 2008 Jan 16.

Weak values and the Leggett-Garg inequality in solid-state qubits.

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1
Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.

Erratum in

  • Phys Rev Lett. 2009 Aug 21;103(8):089902.

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.

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