Photon blockade in a double-transmon system with ultrastrong coupling  

作　　者：Tian Tian Xianhe Zhu Xi Tian 田甜;朱先和;田茜

机构地区：[1]School of Materials Science and Engineering,Changchun University,Changchun 130022,China

出　　处：《Communications in Theoretical Physics》2025年第2期81-86,共6页理论物理通讯(英文版)

基　　金：supported by the National Science Foundation of China(Grant No.12105026);Climbing Plan of Changchun University(Grant No.ZKP202010);Educational Commission of Jilin Province of China(Grant No.JJKH20230663KJ)。

摘　　要：The circuit quantum electrodynamics(QED)system has brought us into an ultrastrong and deep coupling regime in the light-matter interaction community,in which the quantum effect has attracted significant interest.In this study,we theoretically investigated the photon blockade phenomenon in a double-transmon system operating in an ultrastrong coupling regime.We considered the effect of the counter-rotating wave terms in the interaction Hamiltonian and derived the master equation in the eigenpresentation.We found that photon blockade occurred in only one of the eigenmodes,and the counter-rotating wave terms enhanced the blockade by reducing the minimum value of the second-order correlation function.This study will be beneficial for the design of single-photon devices in circuit QED systems,especially in the ultrastrong coupling regime.

关 键 词：ultrastrong coupling master equation photon blockade 

分 类 号：O41[理学—理论物理]