Decoherence of a Greenberger–Horne–Zeilinger state in a five-qubit NMR quantum computer

Authors

  • Minaru Kawamura,

    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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  • Takuji Morimoto,

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

    1. Department of Applied Mathematics, Faculty of Science, 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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  • 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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Abstract

This work provides a simple approximate method of creating a Greenberger–Horne–Zeilinger (GHZ) state with high fidelity, using nuclear magnetic resonance (NMR) techniques, and reports on the decoherence process for these GHZ states, which is observed with a pair of encoder and decoder quantum circuits. The prepared GHZ states are verified by measuring the quantum correlations, which are well known as GHZ correlations. The results of the decoherence experiments, show that the GHZ states decay faster than bipartite entangled states such as Bell states by a factor of 1.3, and it appears that two different decoherence processes exist. © 2006 Wiley Periodicals, Inc. Int J Quantum Chem, 2006

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