摘要
考虑双模纠缠相干光场,将其中一束光场注入腔中与一个二能级原子发生共振相互作用,根据腔量子电动力学理论推导出原子系统的演化态.针对原子系统初始状态到目标演化态的动力学过程,利用量子速率极限时间概念来表征原子系统量子态的最大演化速率.通过调节双模纠缠相干光场的相干参数来操控原子系统量子态动力学过程中所能达到的最大演化速率.结果发现:与原子发生相互作用光场的相干参数在一定条件下可以对系统量子态的最大演化速率产生明显的影响;并且当该光场参数不能很好地来操控量子态的最大演化速率时,双模纠缠相干光场间的量子关联可以实现未参加相互作用光场参数对原子系统量子态最大演化速率的远程调控.
We consider a two-mode entangled coherent light field,in which one mode of the light field is injected into the cavity and interacts with a two-level atom.According to the theory of cavity electrodynamics,the evolution state of atomic system is deduced.Aiming at the dynamic process from the initial state of an atomic system to the target evolution state,the quantum speed limit time is used to characterize the maximum evolution rate of the quantum state of an atomic system.The maximum evolution rate of an atomic system can be controlled by adjusting the coherent parameters of the two-mode entangled coherent light field.But up to now,which kind of quantum speed limit time can be better,universal and strict applicable to the quantum dynamics process of any system is still an unresolved important issue.Based on different methods of measuring the distance between two quantum states and different dynamic evolution channels,many definitions of the quantum speed limit time have been given.The quantum speed limit time proposed by Deffner and Lutz(Deffner S,Lutz E 2013 Phys.Rev.Lett.111 010402)and the other deduced by Campaioli et al.(Campaioli F,Pollock F A,Binder F C,Modi K 2018 Phys.Rev.Lett.120 060409;Campaioli F,Pollock F A,Modi K 2018 arXiv:1806.08742)have attracted extensive attention.In this paper,we first compare the advantages of two quantum speed limit times to characterize the maximum evolution rate of quantum states.We find that the quantum speed limit time expression given by Campaioli et al.(Campaioli F,Pollock F A,Modi K 2018 arXiv:1806.08742)in 2018 is a tighter bound when describing the boundary of the shortest time required for the quantum state evolution of a two-level atomic system.Therefore,this paper is mainly based on the quantum speed limit time given by Campaioli et al.to analyze how to achieve the maximum evolution rate of the quantum state of the atomic system by manipulating the parameters of a two-level entangled coherent light field.The results show that the maximum evolution speed of the qua
作者
田聪
鹿翔
张英杰
夏云杰
Tian Cong;Lu Xiang;Zhang Ying-Jie;Xia Yun-Jie(School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,China;Shandong Provincial Key Laboratory of Laser Polarization and Information Technology,Department of Physics,Qufu Normal University,Qufu 273165,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第15期178-186,共9页
Acta Physica Sinica
基金
国家自然科学基金(批准号:61675115)资助的课题~~
关键词
量子速率极限
纠缠相干态
二能级原子
quantum speed limit time
entangled coherent state
two-level atom
