题目/Title：微波驱动下超导量子比特与磁振子的相干耦合
Coherent Coupling of Superconducting Quantum Bit and Magneton Driven by Microwave
作者/Author：徐达, 王逸璞, 李铁夫, 游建强
Da Xu, Yipu Wang, Tiefu Li, Jianqiang You
期刊/Journal：物理学报
Acta Physica Sinica
年份/Issue Date：2022.Mar.
卷（期）及页码/Volume（No.）&pages：Vol.71, No.15, pp.1-8
摘要/Abstract：
实验上展示了钇铁石榴石(YIG)晶体小球中磁振子与超导量子比特的驱动缀饰态之间的相干强耦合,磁振子的加入使得在超导量子比特中形成了双重缀饰态.实验中一个钇铁石榴石晶体小球与一个超导量子比特同时放置在三维谐振腔中,分别通过磁偶极相互作用和电偶极相互作用与谐振腔中的本征场(TE102模式)耦合,并通过腔模作为媒介实现两者之间的有效相干强耦合.给超导量子比特施加一个共振的微波驱动并改变驱动强度,测得耦合系统能级劈裂随驱动强度的变化,并理论上利用粒子-空穴对与玻色场耦合的模型做了计算.在大部分的驱动强度范围内实验结果都与理论计算结果符合得较好,表明驱动下的比特-磁振子耦合系统可以用来模拟粒子-空穴对称对与玻色场的耦合系统.本文使用的混合量子系统为模拟玻色子与费米子的混合系统提供了一个新途径.
The experiment shows the coherent strong coupling between the magnon and the driving dressed state of the superconducting qubit in the yttrium iron garnet (YIG) crystal ball. The addition of the magnon makes the formation of a double dressed state in the superconducting qubit. In the experiment, a yttrium iron garnet crystal ball and a superconducting qubit are placed in a three-dimensional cavity at the same time, Couple with the eigenfield (TE102 mode) in the resonant cavity through magnetic dipole interaction and electric dipole interaction, and realize effective coherent strong coupling between them through the cavity mode as the medium. Apply a resonant microwave drive to the superconducting quantum bit and change the drive intensity, and measure the change of the energy level splitting of the coupling system with the drive intensity, The model of the coupling between the particle hole pair and the Bose field is theoretically calculated. The experimental results are in good agreement with the theoretical calculation results in most of the driving intensity range, indicating that the driven bit-magneton coupling system can be used to simulate the coupling system between the particle hole symmetry pair and the Bose field. The hybrid quantum system used in this paper provides a new way to simulate the hybrid system of boson and fermion