Using qubits to measure fidelity in mesoscopic systems.

  title={Using qubits to measure fidelity in mesoscopic systems.},
  author={G. B. Lesovik and F. Hassler and G. Blatter},
  journal={Physical review letters},
  volume={96 10},
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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