Splitting Single-Photon Polarization State with Weak Cross–Kerr Nonlinearity

We propose a three-party scheme for quantum information splitting(QIS) of an arbitrary single-photon polarization state based on weak cross-Kerr nonlinearity combined with linear optics elements such as polarization beam splitters(PBSs) and half wave plates(HWPs). The scheme is generalized to the arbitrary-party case. With the help of quantum nondemolition(QND) measurements, our schemes can be accomplished in an almost deterministic way. The two schemes are feasible with the current technology.     

电容器理论与摩擦纳米发电机

研究了当电容器内的电介质表面带电荷时电容器的电容和储能,得到二者在形式上与传统电容器完全相同,但所带电量需根据介质表面所带电量进行修正。利用电容理论研究了接触分离式摩擦纳米发电机（triboelectric nanogenerator,TENG）的输出性能,经理论推导和数值计算,得到了接触分离式TENG的电量、电压与输出电流。最后根据理论计算结果详细讨论了TENG的电荷转移过程。研究不仅推广了电容相关理论,而且完善了对TENG工作原理的描述。