超强耦合 regime 下多量子比特纠缠的动态生成

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

作者信息

Liu Xin, Liao Qinghong, Fang Guangyu, Liu Shutian

机构信息

School of Physics and Technology, University of Jinan, Jinan, 250022, People's Republic of China.

Department of Electronic Information Engineering, Nanchang University, Nanchang, 330031, People's Republic of China.

出版信息

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

DOI:10.1038/s41598-019-39265-4

PMID:30814541

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6393681/

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 ≥ 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%.

摘要

我们提出了一种用于在电路量子电动力学的超强耦合 regime 中生成多量子比特 GHZ 态的动态演化协议。通过改变序列的时间长度，该协议适用于任何耦合强度 g/ω ≥ 0.25。在我们的协议中生成 GHZ 态的时间可以在亚纳秒级。考虑到电路量子电动力学的实际参数，由于退相干导致的保真度简并可以低至 0.02%。