Measurement fidelity in the presence of coherent dynamics or dissipation

ORAL

Abstract

We analyze the problem of a charge qubit probed by a quantum point contact when the measurement is concurrent with Hamiltonian-induced coherent dynamics or dissipation. This additional dynamics changes the state of the qubit before the measurement is completed. As a result, the measurement fidelity is reduced. We calculate the reduction in measurement fidelity in these cases. References: S. Ashhab, J. Q. You, and F. Nori, New J. Phys. 11, 083017 (2009); Phys. Scr. T137, 014005 (2009).

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Authors

  • Jian-Qiang You

    Fudan University \& RIKEN

  • Sahel Ashhab

    RIKEN \& University of Michigan, RIKEN and University of Michigan, Institute of Physical and Chemical Research (RIKEN) Japan and Physics Department, University of Michigan, Advanced Science Institute, RIKEN, Wako-shi, Japan

  • Franco Nori

    RIKEN, Japan, RIKEN \& University of Michigan, RIKEN and University of Michigan, Institute of Physical and Chemical Research (RIKEN) Japan and Physics Department, University of Michigan