Using qubits to measure fidelity in mesoscopic systems.

@article{Lesovik2006UsingQT,
  title={Using qubits to measure fidelity in mesoscopic systems.},
  author={G. B. Lesovik and F. Hassler and G. Blatter},
  journal={Physical review letters},
  year={2006},
  volume={96 10},
  pages={
          106801
        }
}
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. 
Quantum gambling using mesoscopic ring qubits
Dynamical Scheme for Interferometric Measurements of Full-Counting Statistics.
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