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Frontiers of Physics

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Front. Phys.    2020, Vol. 15 Issue (2) : 21603    https://doi.org/10.1007/s11467-019-0949-5
RESEARCH ARTICLE
Transferring entangled states of photonic cat-state qubits in circuit QED
Tong Liu1, Zhen-Fei Zheng2, Yu Zhang3, Yu-Liang Fang1, Chui-Ping Yang1()
1. Quantum Information Research Center, Shangrao Normal University, Shangrao 334001, China
2. Key Laboratory of Quantum Information, University of Science and Technology of China, Heifei 230026, China
3. School of Physics, Nanjing University, Nanjing 210093, China
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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-cqubits 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.
Keywords transferring quantum entangled states      photonic cat-state      microwave cavities     
Corresponding Author(s): Chui-Ping Yang   
Issue Date: 20 January 2020
 Cite this article:   
Tong Liu,Zhen-Fei Zheng,Yu Zhang, et al. Transferring entangled states of photonic cat-state qubits in circuit QED[J]. Front. Phys. , 2020, 15(2): 21603.
 URL:  
https://academic.hep.com.cn/fop/EN/10.1007/s11467-019-0949-5
https://academic.hep.com.cn/fop/EN/Y2020/V15/I2/21603
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