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Implementing multi-qubit entanglement of two-level systems inside a superconducting phase qubit

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Abstract.

The interaction between a superconducting phase qubit and the two-level systems located inside the Josephson tunnel barrier is described by the XY model, which is naturally used to implement the i-SWAP gate. With this gate, we propose a scheme to efficiently generate multi-qubit entangled states of such two-level systems, including multipartite W state and cluster states. In particular, it is found that, with the help of the phase qubit, the entanglement witness can be used to efficiently detect the produced multi-qubit entangled states.

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Authors and Affiliations

  1. Laboratory of Quantum Information Technology, ICMP and SPTE, South China Normal University, Guangzhou, P.R. China

    L. B. Yu, Z.-Y. Xue & S. L. Zhu

  2. Department of Physics and Electronic Engineering, Hefei Normal University, Hefei, P.R. China

    L. B. Yu

  3. Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China

    Z. D. Wang

  4. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, P.R. China

    Y. Yu

Authors
  1. L. B. Yu
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  2. Z.-Y. Xue
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  3. Z. D. Wang
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  4. Y. Yu
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  5. S. L. Zhu
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Correspondence to L. B. Yu.

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Yu, L., Xue, ZY., Wang, Z. et al. Implementing multi-qubit entanglement of two-level systems inside a superconducting phase qubit . Eur. Phys. J. D 61, 499–505 (2011). https://doi.org/10.1140/epjd/e2010-00258-5

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  • DOI: https://doi.org/10.1140/epjd/e2010-00258-5

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