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Preparation of pseudopure state in nuclear spin ensemble using CNOT gates combination

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Chinese Science Bulletin

Abstract

Nuclear magnetic resonance (NMR) is one of the experimental schemes for quantum computation. Most initial state of quantum algorithm in NMR computation is the pseudopure state. Until now, there are several methods to prepare pseudopure state. This note, based on the idea of controlled-not (CNOT) gates combination, has analyzed the characteristics of this method in the odd- and even-qubit system. Also, we have designed the pulse sequence for a 4-qubit sample to obtain pseudopure state, and realized it in the experiment. This method reduces the complexity of experiment and gives a high signal-to-noise (S/N) ratio.

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Authors and Affiliations

  1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, 430071, Wuhan, China

    Xiaodong Yang, Daxiu Wei, Jun Luo & Xijia Miao

Authors
  1. Xiaodong Yang
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  2. Daxiu Wei
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  3. Jun Luo
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  4. Xijia Miao
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Correspondence to Xiaodong Yang.

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Yang, X., Wei, D., Luo, J. et al. Preparation of pseudopure state in nuclear spin ensemble using CNOT gates combination. Chin. Sci. Bull. 47, 1856–1860 (2002). https://doi.org/10.1360/02tb9405

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  • DOI: https://doi.org/10.1360/02tb9405

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