2个超导比特纠缠动力学的反转动波效应  

Effect of counter-rotating term on the entanglement dynamics of two superconducting qubits coupling with quantum oscillators

作　　者：钱雷[1] 贺树[2] 段立伟[2] 陈庆虎[1,2] 

机构地区：[1]浙江师范大学海峡两岸统计物理与凝聚态理论研究中心,浙江金华321004 [2]浙江大学物理系,浙江杭州310027

出　　处：《浙江大学学报（理学版）》2015年第1期102-105,共4页Journal of Zhejiang University（Science Edition）

基　　金：国家自然科学基金资助项目(11174254);浙江省自然科学基金资助项目(Z7080203)

摘　　要：研究了2个无相互作用的与各自量子振子耦合的超导量子比特的纠缠动力学.数值结果证明,在强耦合下,必须考虑非转动波效应,以往的转动波近似不再适用.基于著名的转动波近似解析结果,目前可实验实现的强耦合区域与数值结果存在明显差别.而近年发展起来的转动波近似的一级校正得到的结果更接近于精确数值解.该理论结果可激发基于超导比特的相关实验.We investigated entanglement dynamics of two non-interacting superconducting qubits coupled with their own quantum oscillators beyond the rotating-wave approximation （RWA）. The numerically exact studies show that in the strong coupling regime, the RWA is not valid and the effect of the counter-rotating wave should be taken into account. The analytic results for entanglement based on the well-known generalized RWA obviously deviate from the numerical one in the present experimentally accessible coupling regime. In this paper, based on our first-order corrections to the RWA, the analytic results move closely to the numerical ones. It may motivate the relevant experi ments based on the superconducting qubits realized recently.

关 键 词：纠缠动力学 量子比特 比特-振子耦合 反转动波 

分 类 号：O469[理学—凝聚态物理]