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Single-step multipartite entangled states generation from coupled circuit cavities

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Abstract

Green–Horne–Zeilinger states are a typical type of multipartite entangled states, which plays a central role in quantum information processing. For the generation of multipartite entangled states, the singlestep method is more preferable as the needed time will not increase with the increasing of the qubit number. However, this scenario has a strict requirement that all two-qubit interaction strengths should be the same, or the generated state will be of low quality. Here, we propose a scheme for generating multipartite entangled states of superconducting qubits, from a coupled circuit cavities scenario, where we rigorously achieve the requirement via adding an extra z-direction ac classical field for each qubit, leading the individual qubit-cavity coupling strength to be tunable in a wide range, and thus can be tuned to the same value. Meanwhile, in order to obtain our wanted multi-qubits interaction, xdirection ac classical field for each qubit is also introduced. By selecting the appropriate parameters, we numerically shown that high-fidelity multi-qubit GHZ states can be generated. In addition, we also show that the coupled cavities scenario is better than a single cavity case. Therefore, our proposal represents a promising alternative for multipartite entangled states generation.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 11874156), the Key R&D Program of Guangdong Province (Grant No. 2018B0303326001), and the National Key R&D Program of China (Grant No. 2016 YFA0301803).

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  1. Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, and School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou, 510006, China

    Xiao-Tao Mo & Zheng-Yuan Xue

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Correspondence to Zheng-Yuan Xue.

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Mo, XT., Xue, ZY. Single-step multipartite entangled states generation from coupled circuit cavities. Front. Phys. 14, 31602 (2019). https://doi.org/10.1007/s11467-019-0888-1

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