Zhang J, Wang J J, Yang R G, Liu K, Gao J R
Opt Express. 2017 Oct 30;25(22):27172-27181. doi: 10.1364/OE.25.027172.
In recent continuous-variable (CV) multipartite entanglement researches, the number of fully inseparable light modes has been increased dramatically by the introduction of a multiplexing scheme in either the time domain or the frequency domain. In this paper, we propose a scheme that a large-scale (≥ 20) CV dual-rail cluster entangled state is established based on a spatial mode comb in a self-imaging optical parametric oscillator, which is pumped by two spatial Laguerre-Gaussian modes with different polarization and identical frequency. A sufficient condition of full inseparability for a CV dual-rail cluster entangled state is used to evaluate the degree of quantum entanglement. It is shown that entanglement exists over a wide range of analyzing frequency and pump parameter. We have found a new scheme that uses the optical parametric cavity to generate a large-scale entanglement based on optical spatial mode comb. The presented system will be hopefully as a practical entangled source for quantum information.
在最近的连续变量（CV）多体纠缠研究中，通过在时域或频域引入复用方案，完全不可分的光模式数量大幅增加。本文提出了一种基于自成像光学参量振荡器中的空间模式梳建立大规模（≥20）CV双轨簇纠缠态的方案，该振荡器由两个具有不同偏振和相同频率的空间拉盖尔 - 高斯模式泵浦。利用CV双轨簇纠缠态完全不可分的充分条件来评估量子纠缠程度。结果表明，在很宽的分析频率和泵浦参数范围内都存在纠缠。我们发现了一种基于光学空间模式梳利用光学参量腔产生大规模纠缠的新方案。所提出的系统有望成为量子信息的实用纠缠源。
