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Quantum cloning machine of a state in a belt of Bloch sphere

  • Quantum Optics and Quantum Information
  • Regular Article
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Abstract

We analyze the problem of approximate quantum cloning when the quantum state is between two latitudes on the Bloch’s sphere. We present an analytical formula for the optimized 1-to-2 cloning. The formula unifies the universal quantum cloning (UQCM) and the phase covariant quantum cloning.

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Authors and Affiliations

  1. Department of Physics, Tsinghua University, Beijing, 100084, P.R. China

    J. Z. Hu & X. B. Wang

  2. Department of Mathematical Sciences, Tsinghua University, Beijing, 100084, P.R. China

    Z. W. Yu

  3. Tsinghua National Laboratory for Information Science and Technology, Beijing, 100084, P.R. China

    X. B. Wang

Authors
  1. J. Z. Hu
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  2. Z. W. Yu
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  3. X. B. Wang
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Corresponding author

Correspondence to X. B. Wang.

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Hu, J., Yu, Z. & Wang, X. Quantum cloning machine of a state in a belt of Bloch sphere. Eur. Phys. J. D 51, 381–385 (2009). https://doi.org/10.1140/epjd/e2008-00227-7

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  • DOI: https://doi.org/10.1140/epjd/e2008-00227-7

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