Enhanced quantum state detection efficiency through quantum information processing.

  title={Enhanced quantum state detection efficiency through quantum information processing.},
  author={Tobias Schaetz and Murray D Barrett and Dietrich Leibfried and Joe Britton and John Chiaverini and Wayne M. Itano and John D. Jost and Emanuel Knill and Chris Langer and David J. Wineland},
  journal={Physical review letters},
  volume={94 1},
We investigate theoretically and experimentally how quantum state-detection efficiency is improved by the use of quantum information processing (QIP). Experimentally, we encode the state of one 9Be(+) ion qubit with one additional ancilla qubit. By measuring both qubits, we reduce the state-detection error in the presence of noise. The deviation from the theoretically allowed reduction is due to infidelities of the QIP operations. Applying this general scheme to more ancilla qubits suggests… CONTINUE READING

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