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Preparation of entangled W states with cat-state qubits in circuit QED

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Abstract

Cat-state qubits (qubits encoded with cat states) have recently attracted much attention because of their enhanced lifetimes with quantum error correction. We here consider a circuit QED system consisting of three superconducting qutrits, each coupled to an individual cavity but all coupled to a common cavity. We show that entangled W states of three cat-state qubits hosted by the three individual cavities can be prepared with only a few basic operations. The higher energy level of the qutrits is not occupied; thus, decoherence from this level of the qutrits is greatly suppressed. In addition, the W states can be prepared deterministically. Numerical simulations show that high-fidelity production of the W states of three cat-state qubits is feasible with current circuit QED technology. This proposal is quite general and can be applied to create the proposed W states, with each cavity being a microwave or optical cavity and each qutrit being a three-level natural or artificial atom.

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Acknowledgements

This work was partly supported by the Key-Area Research and Development Program of Guangdong province (2018B030326001), the National Natural Science Foundation of China (NSFC) (11074062, 11374083, 11774076, 11890704, 61521001), the Jiangxi Natural Science Foundation (20192ACBL20051), and the NKRDP of China (2016YFA0301802).

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  1. School of Physics, Nanjing University, Nanjing, 210093, China

    Yu Zhang & Yang Yu

  2. Quantum Information Research Center, Shangrao Normal University, Shangrao, 334001, Jiangxi, China

    Tong Liu & Chui-Ping Yang

  3. Department of Physics, Hangzhou Normal University, Hangzhou, 311121, China

    Chui-Ping Yang

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  1. Yu Zhang
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Zhang, Y., Liu, T., Yu, Y. et al. Preparation of entangled W states with cat-state qubits in circuit QED. Quantum Inf Process 19, 218 (2020). https://doi.org/10.1007/s11128-020-02715-4

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