基于弱交叉克尔非线性的C-GHZ态制备与分析

Preparation and analysis of C-GHZ state based on weak cross-Kerr nonlinearity

为了解决Concatenated GHZ(C-GHZ)态制备复杂的问题,提出了一种基于弱交叉克尔非线性产生C-GHZ态的改进方案。结合零差探测技术和经典的前置反馈作用,用封装的光学元件模块和HWP 22.5°半波片,经反复操作,由简单的C-GHZ态推导出nm-GHZ态,最后得出C-GHZ态制备规律,得出所需辅助单光子数nm,模块数nm-1和HWP22.5°半波片数n。进行了成功率模拟和可行性分析,结果表明增大相干态|α>的振幅强度和减少光子传输的损耗可以提高C-GHZ态制备的成功率.

In order to solve the complex problem of concatenated GHZ(C-GHZ)state preparation,an improved scheme of C-GHZ state based on weak cross Kerr nonlinearity is proposed.Combining with the homodyne detection technology and the classical feedforward,the packaged optical element module and HWP22.5°half-wave plate are used to deduce the nm C-GHZ state from the simple C-GHZ state after repeated operation.Finally the preparation law of C-GHZ state is obtained.The required number of auxiliary single photons is nm,the number of modules is nm-1,and the number of HWP22.5°is n.The success rate simulation and feasibility analysis are conducted.Results show that increasing the amplitude intensity of coherent state|α>and reducing the loss of photon transmission can improve the success rate of C-GHZ state preparation.