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Transferring entangled states of photonic cat-state qubits in circuit QED

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Abstract

We propose a method for transferring quantum entangled states of two photonic cat-state qubits (cqubits) from two microwave cavities to the other two microwave cavities. This proposal is realized by using four microwave cavities coupled to a superconducting flux qutrit. Because of using four cavities with different frequencies, the inter-cavity crosstalk is significantly reduced. Since only one coupler qutrit is used, the circuit resource is minimized. The entanglement transfer is completed with a singlestep operation only, thus this proposal is quite simple. The third energy level of the coupler qutrit is not populated during the state transfer, therefore decoherence from the higher energy level is greatly suppressed. Our numerical simulations show that high-fidelity transfer of two-cqubit entangled states from two transmission line resonators to the other two transmission line resonators is feasible with current circuit QED technology. This proposal is universal and can be applied to accomplish the same task in a wide range of physical systems, such as four microwave or optical cavities, which are coupled to a natural or artificial three-level atom.

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Acknowledgements

This work was partly supported by the Key-Area Research and Development Program of GuangDong Province (Grant No. 2018B030326001), the National Natural Science Foundation of China (NSFC) (Grant Nos. 11074062, 11374083, and 11774076), the NKRDP of China (Grant No. 2016YFA0301802), and the Jiangxi Natural Science Foundation (Grant No. 20192ACBL20051).

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Authors and Affiliations

  1. Quantum Information Research Center, Shangrao Normal University, Shangrao, 334001, China

    Tong Liu, Yu-Liang Fang & Chui-Ping Yang

  2. Key Laboratory of Quantum Information, University of Science and Technology of China, Heifei, 230026, China

    Zhen-Fei Zheng

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

    Yu Zhang

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  1. Tong Liu
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Liu, T., Zheng, ZF., Zhang, Y. et al. Transferring entangled states of photonic cat-state qubits in circuit QED. Front. Phys. 15, 21603 (2020). https://doi.org/10.1007/s11467-019-0949-5

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  • DOI: https://doi.org/10.1007/s11467-019-0949-5

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