Using Qubits to Measure Fidelity in Mesoscopic Systems

Details Using Qubits to Measure Fidelity in Mesoscopic Systems Using Qubits to Measure Fidelity in Mesoscopic Systems

2005-07-08

arxiv.org/abs/cond-mat/0507200v3

Phys. Rev. Lett. 96, 106801 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.96.106801

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.

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