浅谈如何学好量子力学

简要概括了量子力学的产生过程,详细论述了学好量子力学的关键,并将量子力学中薛定谔方程与经典力学中牛顿方程作了比较。     

现代大学物理实验对培养学生创新素质的作用

简要分析了现代大学物理实验教学的现状,着重介绍了现代大学物理实验与创新素质的密切关系,讨论了现代大学物理实验对培养学生创新素质的作用。     

三粒子GHZ态的量子信息分离方案(英文)

提出一个用GHZ态作为量子信道分离类GHZ态的方案.如果发送者Alice预先知道原量子态,Alice执行两量子比特投影测量后,接收者Bob和Charlie一起合作能恢复初态.我们计算了这个方案成功的几率和消耗的经典信息.一般地,Alice能成功地分离量子态的几率是1/4和消耗的经典信息是3/4经典比特.然而,在五种特殊情形下,消耗一些多余经典信息后,成功的几率能达到1/2甚至1.     

Entanglement of movable mirror and cavity field enhanced by an optical parametric amplifier

A scheme to generate entanglement in a cavity optomechanical system filled with an optical parametric amplifier is proposed. With the help of the optical parametric amplifier, the stationary macroscopic entanglement between the movable mirror and the cavity field can be notably enhanced, and the entanglement increases when the parametric gain increases.Moreover, for a given parametric gain, the degree of entanglement of the cavity optomechanical system increases with increasing input laser power.     

Continuous variable entanglement generation in coupled cavities

We investigate continuous variable entanglement produced in two distant coupled cavities, in which two four-level atoms are driven by classical fields respectively. Under the large detuning condition, an effective Hamiltonian containing the square of the creation (annihilation) operator of the cavity field is derived. Due to the nonlinearity, entanglement formally created by the beam splitter type interaction is transformed into the nondegenerate parametric down conversion type. Employing the operator algebraic method, we study the time evolution of the entanglement condition, and show that the system provides us an advantage in achieving a larger photon number with better entanglement. We also discuss the dissipation of the cavities affecting the entanglement.     

多声子系统的多光机械诱导透明

提出了一个光学腔中包含三个可移动镜子的混合腔光机械系统的理论方案,这个光学腔被一束较强的耦合场和一束较弱的探测场驱动与三个机械振子线性耦合.利用平均场近似理论,得到系统的稳态解,并数值模拟了系统输出的探测场随失谐的变化关系.分析与数值结果显示,当三个机械振子的振动频率互不相等时,该系统出现三个透明窗口,当三个振子的振动频率两两相等、或三个都相等时,三透明就变成了双透明或单一透明窗口;同时发现,在所选取的参数范围内,腔场与振子之间的有效耦合系数及腔场的衰减率能够调控透明窗口的宽度,有效耦合系数越大或衰减率越小,透明窗口越宽;如果腔中存在N个机械振子,当N个机械振子的频率互不相等时,此系统会出现N透明现象,否则,透明窗口的个数会有所减少.     

Controlling multiple optomechanically induced transparency in the distant cavity-optomechanical system

We theoretically investigate a two-cavity optomechanical system in which each optical cavity couples to a mechanical resonator via radiation pressure force,and the two optical cavities couple to each other via a distant waveguide.Our study shows that the multiple optomechanically induced transparency can be observed from the output field at the probe frequency.The number and width of the transparent windows can be tuned by the classical driving power Pl.We also analyze the distance of the two outermost transparency windows,which shows a linear relation with the parameters Pl andλ.Our approach is feasible for controlling multipartite induced transparency,which represents a valuable step towards quantum networks with photonic and phononic circuits.