【摘 要】
：
We study,in the framework of open quantum systems,the entanglement generation of two atoms in between two parallel mirrors in a thermal bath of quantum scalar fields.We find that the presence of mirrors plays an important role in entanglement generation a
【机 构】
：
Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications,Hunan No
论文部分内容阅读
We study,in the framework of open quantum systems,the entanglement generation of two atoms in between two parallel mirrors in a thermal bath of quantum scalar fields.We find that the presence of mirrors plays an important role in entanglement generation and protection.The entanglement dynamics is crucially dependent on the geometric configurations of the two-atom system with respect to the mirrors,and the ranges of temperature and interatomic separation within which entanglement can be generated are significantly changed compared with those in a free space.In particular,when the atomic transition wavelength is larger than twice the distance between the two mirrors,the atoms behave as if they were isolated from the environment and the entanglement can persist in the steady state if the atoms are initially entangled and no entanglement can be created if they are initially separable,no matter how the atoms are placed with respect to the mirrors and to each other.This is in sharp contrast to the fact that in a free space,steady-state entanglement is possible only when the two atoms are placed extremely close to each other,while in the presence of one mirror,it is possible when the two atoms placed extremely close to the mirror.
其他文献
Under investigation in this paper is a relativistic Toda lattice system with one perturbation parameter α abbreviated as RTL_(α)system by Suris,which may describe the motions of particles in lattices interacting through an exponential interaction force.Fi
锂离子电池在能量密度和工作电压等关键工作性能方面具有很大的优势,广泛应用于电化学储能系统中.锂离子电池由于具有能量密度高、电解质易燃、隔膜稳定性低等特性,不可避免地出现热失控等安全问题.若局部区域电池的热失控事件不能有效控制,将导致热失控事件扩展至系统层面,造成严重安全问题.因此,在电池体系未能取得重点突破,本征安全问题不能根本解决时,锂离子电池热失控扩展的有效抑制尤为重要.本文针对锂离子电池热失控扩展问题,首先介绍了热失控触发诱因与机理;然后从电气特征和传热特征两个角度阐述了热失控扩展特征,为热失控扩展
火山活动是影响气候变率的重要外强迫因子,研究火山喷发对气候的影响有助于提高对温度变化的提前预警,也对未来地球工程计划具有指示意义.然而,目前仍不清楚不同纬度的火山喷发影响北半球不同纬度温度变化的特征、敏感性和影响机理.本研究基于通用地球系统模式完成了涵盖过去2000年的火山活动敏感性试验,并挑选出大于5 Tg的21个北半球火山(NHV)、31个热带火山(TRV)和18个南半球火山(SHV)喷发事件,分别探究了这三类火山喷发对北半球低、中和高纬度温度变化的影响.研究发现:TRV的总喷发强度是NHV和SHV的
森林垂直结构参数指的是森林冠层孔隙率、郁闭度、叶面积指数(leaf area index, LAI)和聚集指数(clumping index, CI)等关键结构参数在垂直方向的分布特征.获取森林垂直结构参数是深入研究森林碳氮水循环和遥感辐射传输过程的关键环节.本文聚焦LAI和CI,探讨森林垂直结构参数地面实测与遥感反演研究进展.地面测量的常用仪器有LAI-2200、数字半球相机和光合有效辐射(ph
纳米ZnO的大量生产和使用,使其不可避免地被释放到水环境中,对水生生物产生潜在危害.研究表明,粒径是影响纳米ZnO水生毒性的重要因素之一.然而,纳米ZnO的粒径对其在生物体累积及诱导氧化应激的程度尚不清楚.为了阐明粒径对纳米ZnO的生物累积和诱导氧化应激的影响,本研究考察了大型溞(Daphnia magna)分别暴露于3种粒径ZnO(原始粒径为30、50和90 nm)时生物体Zn累积量、氧化应激生物标志物的动态变化,并分析了在单位内暴露剂量(单位Zn累积量)下粒径对纳米ZnO诱导大型溞氧化损伤的差异.结果
We derive the chiral effective Lagrangian for excited heavy-light mesons from QCD under proper approximations.We focus on the chiral partners with jlP = 3/2+and jlP = 3/2-which amounts to(1+,2+)and(1-,2-)states respectively.The low energy constants includ
The Euler-Maclaurin summation formula is generalized to a modified form by expanding the periodic Bernoulli polynomials as its Fourier series and taking cuts,which includes both the Euler-Maclaurin summation formula and the Poisson summation formula as sp
In this paper,we show how to recover the low-temperature and high-density information of ideal quantum gases from the high-temperature and low-density approximation by the Padé approximant.The virial expansion is a high-temperature and low-density expansi
Most of the important aspects of soliton propagation through optical fibers for transcontinental and transoceanic long distances can best be described using the nonlinear Schrodinger equation.Optical solitons are electromagnetic waves that span in nonline
Gentile statistics describes fractional statistical systems in the occupation number representation.Anyon statistics researches those systems in the winding number representation.Both of them are intermediate statistics between Bose-Einstein and Fermi-Dir