Using Qubits to Measure Fidelity in Mesoscopic Systems

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We point out the similarities in the definition of the `fidelity' of a quantum system and the generating function determining the full counting statistics of charge transport through a quantum wire and suggest to use flux- or charge qubits for their measurement. As an application we use the notion of fidelity within a first-quantized formalism in order to derive new results and insights on the generating function of the full counting statistics.
5 pages, 1 figure

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Mesoscale and Nanoscale Physics, Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/122081

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0507200
 http://arxiv.org/abs/cond-mat/0507200
 Phys. Rev. Lett. 96, 106801 (2006)
 doi:10.1103/PhysRevLett.96.106801

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arXiv