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Scheme for directly measuring the concurrences of Collins–Gisin and Werner classes polarization entangled mixed states

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Abstract

We present a two-copy-based protocol for directly measuring the concurrence of two-photon polarization entangled mixed states (Collins–Gisin class state and the more complicated bipartite mixed entangled state—Werner class state) without quantum state tomography. The quantum circuit designed for directly measuring concurrence can be realized in an optical system. Our protocol works without the sophisticated controlled-NOT gate, which makes it much simpler than the previous ones. Because all the operations used here are local, the scheme can be used for directly measuring remote mixed entanglement too.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 11274010, 11374085, 61370090).

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Authors and Affiliations

  1. School of Physics and Material Science, Anhui University, Hefei, 230601, China

    Ting Zeng, Wen-Jing Chu, Qing Yang, Ming Yang & Zhuo-Liang Cao

  2. School of Electronic and Information Engineering, Hefei Normal University, Hefei, 230601, China

    Wei Song & Zhuo-Liang Cao

Authors
  1. Ting Zeng
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  2. Wen-Jing Chu
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  3. Qing Yang
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  4. Ming Yang
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  5. Wei Song
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  6. Zhuo-Liang Cao
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Correspondence to Ming Yang or Zhuo-Liang Cao.

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Zeng, T., Chu, WJ., Yang, Q. et al. Scheme for directly measuring the concurrences of Collins–Gisin and Werner classes polarization entangled mixed states. Quantum Inf Process 16, 262 (2017). https://doi.org/10.1007/s11128-017-1713-9

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