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Improvement of hybrid entanglement by dual-way photon polarization measurement

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Abstract

We propose a scheme of dual-way photon polarization measurement to promote the performance of post-selected polarization hybrid entanglement presented by Tiunov et al. (AIP Conference Proceedings, 020017, 2018). With on–off single-photon detectors, the scheme can mitigate the effects of two- and multi-photons on the prepared hybrid entanglement and improve its fidelity, especially for large entanglement amplitude \(\alpha_{f}\). The influences of optical loss on prepared states are also discussed. It is demonstrated that the loss on the discrete-variable channel has little effect on the prepared states, even for the loss greater than 0.9. Using squeezed vacuum as approximate coherent superposition state, we calculate the fidelity of hybrid entanglement under real experimental conditions. The results show that with same fidelity our scheme can achieve higher generation probability compared with reference Tiunov et al. (AIP Conference Proceedings, 020017, 2018), and the hybrid entanglement with medium amplitude (\(\alpha_{f} = 1.5\)) and high fidelity (\({\text{Fidelity}} > 80\%\)) can be produced with currently available technology.

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Acknowledgements

This work was supported by the Key Project of the Ministry of Science and Technology of China (Grant No. 2016YFA0301402) and by the National Natural Science Foundation of China (Grants Nos. 11834010, 11274211, 11604191 and 61805133).

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Authors and Affiliations

  1. The State Key Laboratory of Quantum Optics and Quantum Optics Devices, Collaborative Innovation Center of Extreme Optics, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, People’s Republic of China

    Shujing Li, Yaya He, Qiqi Deng, Jiaoyang Xue, Zhongxiao Xu & Hai Wang

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  1. Shujing Li
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  2. Yaya He
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Correspondence to Shujing Li or Hai Wang.

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Li, S., He, Y., Deng, Q. et al. Improvement of hybrid entanglement by dual-way photon polarization measurement. Quantum Inf Process 20, 295 (2021). https://doi.org/10.1007/s11128-021-03221-x

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