摘要
We develop a new spectroscopic method to quickly and intuitively characterize the coupling of two microwave-photon-coupled semiconductor qubits via a high-impedance resonator.Highly distinctive and unique geometric patterns are revealed as we tune the qubit tunnel couplings relative to the frequency of the mediating photons.These patterns are in excellent agreement with a simulation using the Tavis-Cummings model,and allow us to readily identify different parameter regimes for both qubits in the detuning space.This method could potentially be an important component in the overall spectroscopic toolbox for quickly characterizing certain collective properties of multiple cavity quantum electrodynamics(QED)coupled qubits.
本文利用高阻抗微波谐振腔实现了两个半导体量子比特间的长程耦合,并在此基础上进一步开发了一种新型谱学方法,快速、直观地表征了量子比特之间的耦合关系.运用该谱学方法,实验上测量得到一系列随隧穿耦合速率变化的独特、高辨识度的图谱,且通过这些图谱可以快速定性地判断两个比特的耦合区间,并与利用Tavis-Cummings模型得到的模拟结果高度一致.本文从一个新的角度(参数空间)对腔电动力学杂化系统进行表征,提供了一种在多比特情况下也适用的新型谱学表征方法,有效提高了表征多比特杂化系统、调制比特参数的效率,为研究以光子为耦合媒介的多比特系统相互作用提供了新的研究思路.
作者
Baochuan Wang
Ting Lin
Haiou Li
Sisi Gu
Mingbo Chen
Guangcan Guo
Hongwen Jiang
Xuedong Hu
Gang Cao
Guoping Guo
王保传;林霆;李海欧;顾思思;陈明博;郭光灿;姜弘文;胡学东;曹刚;郭国平(CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China.Hefei 230026,China;Department of Physics and Astronomy,University of California at Los Angeles,Los Angeles,CA 90095,USA;Department of Physics,University at Buffalo,SUNY,Buffalo,NY 14260-1500,USA;Origin Quantum Computing Company Limited,Hefei 230026,China)
基金
supported by the National Key Research and Development Program of China(2016YFA0301700)
the National Natural Science Foundation of China(61922074,11674300,61674132,11625419 and 11804327)
the Strategic Priority Research Program of the CAS(XDB24030601)
the Anhui Initiative in Quantum Information Technologies(AHY080000)
financial support by U.S.ARO through Grant No.W911NF1410346 and No.W911NF1710257。
