Enhanced quantum state detection efficiency through quantum information processing

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-detectio...

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Bibliographic Details
Published in:Physical review letters 2005-01, Vol.94 (1), p.010501.1-010501.4, Article 010501
Main Authors: SCHAETZ, T, BARRETT, M. D, LEIBFRIED, D, BRITTON, J, CHIAVERINI, J, ITANO, W. M, JOST, J. D, KNILL, E, LANGER, C, WINELAND, D. J
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
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Summary: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 that error in the individual qubit measurements need not be a limit to scalable quantum computation.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.010501