Using qubits to measure fidelity in mesoscopic systems |
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Authors: | Lesovik G B Hassler F Blatter G |
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Institution: | L.D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia. |
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Abstract: | 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. |
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