Dynamic generation of multi-qubit entanglement in the ultrastrong-coupling regime

Xin Liu; Qinghong Liao; Guangyu Fang; Shutian Liu

doi:10.1038/s41598-019-39265-4

Dynamic generation of multi-qubit entanglement in the ultrastrong-coupling regime

Sci Rep. 2019 Feb 27;9(1):2919. doi: 10.1038/s41598-019-39265-4.

Authors

Xin Liu¹, Qinghong Liao², Guangyu Fang³, Shutian Liu³

Affiliations

¹ School of Physics and Technology, University of Jinan, Jinan, 250022, People's Republic of China. sps_liux@ujn.edu.cn.
² Department of Electronic Information Engineering, Nanchang University, Nanchang, 330031, People's Republic of China.
³ Department of Physics, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.

Abstract

We propose a dynamic evolution protocol for generating multi-qubit GHZ states in the ultrastrong-coupling regime of circuit QED. By varying the time length of sequences, the protocol works for any coupling strength g/ω_r ≥ 0.25. The time for generating the GHZ states in our protocol can be in the subnanoseconds. By taking into account realistic parameters of circuit QED, the degeneracy of fidelity due to decoherence can be as low as 0.02%.