Digital Quantum Rabi and Dicke Models in Superconducting Circuits

We propose the analog-digital quantum simulation of the quantum Rabi and Dicke models using circuit quantum electrodynamics (QED). We find that all physical regimes, in particular those which are impossible to realize in typical cavity QED setups, can be simulated via unitary decomposition into digital steps. Furthermore, we show the emergence of the Dirac equation dynamics from the quantum Rabi model when the mode frequency vanishes. Finally, we analyze the feasibility of this proposal under realistic superconducting circuit scenarios.

Modelization and analysis of the electric arc in low voltage circuit breakers

246 p.

Compact continuous-wave blue lasers by direct frequency doubling of laser diodes with periodically poled lithium niobate waveguide crystals

A compact continuous-wave blue laser has been demonstrated by direct frequency doubling of a laser diode with a periodically poled lithium niobate (PPLN) waveguide crystal. The optimum PPLN temperature is near 28 degreesC, and the dependence of waveguide crystals on crystal temperature is less sensitive than that of bulk crystals. A total of 14.8 mW of 488-nm laser power has been achieved. (C) 2005 Optical Society of America.

基于菲佐干涉仪与多通道光电倍增管阵列的多普勒频移检测技术

提出了基于菲佐干涉仪和多通道光电倍增管(PMT)阵列探测器组合的多普勒频移检测的方案, 适用于风速测量的直接探测多普勒激光雷达。首先介绍了工作原理, 再根据菲佐干涉仪光谱特征对频移检测用干涉仪进行了优化设计, 优化设计的菲佐干涉仪腔长150mm、平板反射率0.755。对提出的菲佐干涉仪和多通道光电倍增管阵列探测器组合的方案进行了数值模拟, 以分子散射作为背景噪声, 计算了该方法的风速测量误差。模拟结果表明, 设计的基于菲佐干涉仪的直接探测多普勒测风激光雷达, 在30 s的积分时间内、探测高度5 km以下,