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Generation and swapping of multi-qubit entangled state in a coupled superconducting resonator array

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Abstract

An efficient method is proposed for the generation and swapping of multi-qubit entangled state in an array of linearly coupled superconducting resonators, each of which is coupled to N superconducting qubits. With the external driving fields to adjust the desired qubit–resonator interaction, we firstly show that the multipartite entangled state of superconducting qubits hosted in two nearest-neighbor interacting resonators can be deterministically realized. Furthermore, by utilizing the produced entangled state, we put forward a protocol for the swapping of quantum entangled state in the coupled resonator array based on measurement, i.e., the multi-particle entangled state can be achieved for the qubits in long-distance separated resonators. The numerical simulation suggests that our scheme is feasible with current circuit QED technology.

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Acknowledgements

The work was partly supported by the National Nature Science Foundation of China (Grant Nos. 11704306 and 11534008) and the National Key R&D Project (Grant No. 2016YFA0301404), and the China Postdoctoral Science Foundation (Grant No. 2016M602795).

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  1. Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices and Department of Applied Physics, School of Science, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China

    Xinke Li, Shengli Ma, Yuan Zhou, Jikun Xie & Fuli Li

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  1. Xinke Li
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Li, X., Ma, S., Zhou, Y. et al. Generation and swapping of multi-qubit entangled state in a coupled superconducting resonator array. Quantum Inf Process 17, 336 (2018). https://doi.org/10.1007/s11128-018-2102-8

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