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Schemes generating entangled states and entanglement swapping between photons and three-level atoms inside optical cavities for quantum communication

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Abstract

We propose quantum information processing schemes based on cavity quantum electrodynamics (QED) for quantum communication. First, to generate entangled states (Bell and Greenberger–Horne–Zeilinger [GHZ] states) between flying photons and three-level atoms inside optical cavities, we utilize a controlled phase flip (CPF) gate that can be implemented via cavity QED). Subsequently, we present an entanglement swapping scheme that can be realized using single-qubit measurements and CPF gates via optical cavities. These schemes can be directly applied to construct an entanglement channel for a communication system between two users. Consequently, it is possible for the trust center, having quantum nodes, to accomplish the linked channel (entanglement channel) between the two separate long-distance users via the distribution of Bell states and entanglement swapping. Furthermore, in our schemes, the main physical component is the CPF gate between the photons and the three-level atoms in cavity QED, which is feasible in practice. Thus, our schemes can be experimentally realized with current technology.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. NRF-2015R1A2A2A03004152).

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Authors and Affiliations

  1. School of Information and Communication Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Republic of Korea

    Jino Heo, Hyeon Yang & Seong-Gon Choi

  2. Center for Quantum Information, Korea Institute of Science and Technology (KIST), Seoul, 136-791, Republic of Korea

    Min-Sung Kang

  3. National Security Research Institute, P.O.Box 1, Yuseong, Daejeon, 34188, Republic of Korea

    Chang-Ho Hong

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  1. Jino Heo
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Heo, J., Kang, MS., Hong, CH. et al. Schemes generating entangled states and entanglement swapping between photons and three-level atoms inside optical cavities for quantum communication. Quantum Inf Process 16, 24 (2017). https://doi.org/10.1007/s11128-016-1459-9

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