Study of decoherence in a NMR quantum computer using tetrafluoropyridine

Authors

  • Minaru Tei,

    Corresponding author
    1. Department of Electronic Engineering, Faculty of Engineering, Okayama University of Science, Ridai-cho 1-1, Okayama 700-0005, Japan
    • Department of Electronic Engineering, Faculty of Engineering, Okayama University of Science, Ridai-cho 1-1, Okayama 700-0005, Japan
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  • Yoichi Mizuno,

    1. Graduate School of Engineering, Okayama University of Science, Ridai-cho 1-1, Okayama 700-0005, Japan
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  • Yoshinori Manmoto,

    1. Department of Electronic Engineering, Faculty of Engineering, Okayama University of Science, Ridai-cho 1-1, Okayama 700-0005, Japan
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  • Ryuichi Sawae,

    1. Department of Applied Mathematics, Faculty of Science, Okayama University of Science, Ridai-cho 1-1, Okayama 700-0005, Japan
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  • Kenichi Takarabe

    1. Department of Applied Science, Faculty of Science, Okayama University of Science, Ridai-cho 1-1, Okayama 700-0005, Japan
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Abstract

Recently, quantum algorithms have been realized on a quantum computer by using a nuclear magnetic resonance technique. The nuclear magnetic resonance quantum computer (NMR-QC) consists of nuclear spins of molecules that are coupled by J-coupling to each other and the nuclear spins take a role of quantum bits (qubits). In performing quantum algorithms on NMR-QC, the decoherence effects are a key problem. We studied the decoherence effects in the four-qubit NMR-QC using the fluorine nuclear spins of tetrafluoropyridine molecules. The nitrogen nuclear spin in the tetrafluoropyridine molecule increases the transverse relaxation rate of nearby fluorine nuclear spins about 10 times because of its quadrupole moment. In this study we evaluated the decoherence effects in the NMR-QC by utilizing controlled-not quantum gates. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2003

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