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On-Chip Multiphoton Entangled States by Path Identity

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Abstract

Multiphoton entanglement, as a quantum resource, plays an essential role in linear optical quantum information processing. Krenn et al. (Phys. Rev. Lett. 118, 080401 2017) proposed an innovative scheme that generating entanglement by path identity, in which two-photon interference (called Hong-Ou-Mandel effect) is not necessary in experiment. However, the experiments in this scheme have strict requirements in stability and scalability, which is difficult to be realized in bulk optics. To solve this problem, in this paper we first propose an on-chip scheme to generate multi-photon polarization entangled states, including Greenberger-Horne-Zeilinger (GHZ) states and W states. Moreover, we also present a class of generalized graphs for W states (odd-number-photon) by path identity in theory. The on-chip scheme can be implemented in existing integrated optical technology which is meaningful for multi-party entanglement distribution in quantum communication networks.

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Acknowledgments

The research is funded by Project supported by the National Science Foundation of Guangdong Province, China (Grant No.2016A030312012).

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Authors and Affiliations

  1. School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou, 510000, China

    Tianfeng Feng, Yuling Tian & Qin Feng

  2. Department of Computer Science, Jinan University, Guangzhou, 510632, China

    Xiaoqian Zhang

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  1. Tianfeng Feng
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Feng, T., Zhang, X., Tian, Y. et al. On-Chip Multiphoton Entangled States by Path Identity. Int J Theor Phys 58, 3726–3733 (2019). https://doi.org/10.1007/s10773-019-04243-z

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