【摘 要】
:
The entanglement dynamics involving the so-called entanglement sudden death of atoms in two-photon Tavis-Cummings model is investigated. Various initial conditions that may have influences on the entanglement evolution of atoms, especially on the appearan
【机 构】
:
CollegeofPhysicsandEngineering,QufuNormalUniversity,Qufu273165,ChinaDepartmentofPhysicsandInformatio
【出 处】
:
ChineseOpticsLetters
论文部分内容阅读
The entanglement dynamics involving the so-called entanglement sudden death of atoms in two-photon Tavis-Cummings model is investigated. Various initial conditions that may have influences on the entanglement evolution of atoms, especially on the appearance of atomic entanglement sudden death, are studied. The appearance of entanglement sudden death is sensitive to the initial conditions of the whole system, i.e., the concrete type of atomic initial state, the photon number in the cavity field, and the dipole-dipole interaction between atoms. It is shown that the strong dipole-dipole interaction between atoms can weaken the atomic entanglement sudden death.
其他文献
Reflectance model is a basic concept in computer vision. Some existing models combining the classical diffuse reflectance model and those for surfaces containing specular components can approximately describe real reflectance. But the ratio of diffuse and
介绍了半导体激光器外部散热设计的数值模拟方法计算流体力学(CFD)方法。对于流体固体耦合传热问题, 建立对流导热耦合传热模型和质量守恒、能量守恒、动量守恒以及k-ε方程联合控制方程组, 按照给定的边界条件, 利用数值方法进行迭代计算, 求解出高精度的数值结果。对一只最大热功耗15 W的半导体激光器的外部散热设计铝合金片状翅片热沉加轴流风扇强制风冷方案, 用CFD方法进行模拟仿真, 数值计算结果表明设计方案可以较好地满足总体热设计要求。
对作者早先提出的光谱估算方法FAT作进一步探讨,提出利用退卷积技术实现光谱线型优化从而修正估计谱相对强度的方法,同时还提出了反映线型优化度及估计谱可靠性的品质因子的概念。
针对目前甲烷遥测装置因光学准直固定,在不同检测环境使用时不能进行动态调整的问题,在光路准直设计中引入了电控可变焦透镜,实现了光路自动准直。测试结果表明,针对不同的检测距离和辅助目标,通过改变电控可变焦透镜的驱动电流可实现快速变焦,在动态调节激光光束发散效果的同时可使遥测装置的接收光功率最大化,其接收光功率相比无变焦透镜接收光功率可提高1.7倍以上,同时可提高检测系统的信噪比。针对变焦透镜在遥测应用中出现的新问题,如重力效应引起的光束偏转效应,提出了形变模型,并进行了理论计算和仿真分析。使用甲烷气袋进行泄漏
本文对各向异性晶体包层型光纤偏振器进行理论分析.首先用外插法计算了五硼酸钾晶体在长波长范围的折射率,接着以平面介质波导模型计算一侧包层被晶体包裹的光纤偏振器的消光比,又以W光纤模型计算全部晶体包裹的光纤偏振器.最后将两种偏振器性能作了比较和讨论.
光栅是光栅光谱仪的核心部件, 其分光能力直接决定了仪器的光谱分辨率。基于浸没式光栅的光栅光谱仪使用浸没式光栅作为分光元件。推导了浸没式光栅的光谱分辨率方程, 光谱分辨率要求一定时, 与使用普通反射光栅相比, 使用浸没式光栅能够在实现高光谱分辨率的同时大幅减小仪器的体积和重量。介绍了浸没式光栅的常用材料、浸没式光栅在星载和地基高光谱分辨率光栅光谱仪上的应用以及浸没式光栅的制作方法。设计和研制了70 mm硅浸没式光栅, 实测光栅效率
Atomic models of high-Z multicharged ions are extremely complex and require experimental validation. One way to do so is to crosscheck the predicted wavelengths of resonance transitions in He- and Li-like ions against precise spectroscopic measurem
光谱编码型穆勒矩阵测量技术具有测量速度快、结构紧凑、低损耗、无移动部件等优点,单次测量可获取穆勒矩阵全部元素。其主要原理是采用一组特定厚度比例的相位延迟片,将样品的穆勒矩阵元素调制到光谱的频率通道上,再通过光谱的傅里叶变换解调出穆勒矩阵。其中相位延迟片的厚度或延迟量误差将导致解调的穆勒矩阵元素产生较大误差。本文通过理论推导得到具有延迟量误差的光强一般表达式,并详细地推导了利用单一样品求解得到延迟量误差的过程;利用单一样品求解延迟量误差可以避免不同样品对初始相位的影响,提高延迟量误差求解精度;还对穆勒
A novel post-treatment method, including hard hairbrush and electrical treatment, is performed intentionally to improve the field emission capability and stability of screen-printed carbon nanotubes (CNTs). Compared with untreated films, the field emissio