分类： 光学 >> 量子光学 提交时间： 2023-07-10
摘要： 原子系统有反射对称，有宇称，原子受激辐射，经平行平面谐振腔放大，可以产生宏观光子纠缠态[4]。 它是有确定宇称，总动量为零，确定能量，确定角动量的2N光子的量子纠缠态。观测它在时间、空间位置具有不确定性、随机性。根据海森堡测不准原理，其能量（频率）、动量完全确定。测量精度可以达到海森堡量子极限，具有量子2N增强效应（2N为纠缠光子数）。 通过实验测量它的几率分布P2N （t），以及它的傅里叶变换P2N （w-w0 ），实验结果与理论预期符合。并观测了宏观光子纠缠态的寿命，同样具有一个2N增强因子，实验结果与理论预期符合。
分类： 光学 >> 量子光学 提交时间： 2023-06-25
摘要： 多光子纠缠是量子通讯、光量子计算的核心技术。现在普遍使用的纠缠光源是自发参量下转换产生的两光子纠缠，虽已取得很大的成就，但离量子计算等的应用需求还很远，需要从理论和实验两个方面探索新路。 本文研究了受激辐射射基础过程，受激辐射的机理，发现此过程最初产生的两光子态的量子性质与受激辐射物质的对称性密切相关。如果受激辐射物质的电子态有宇称，它的波函数也有宇称，如原子、有对称中心的分子、有反演对称的晶体等，这类物质的电子态都有宇称和反射对称性。有宇称的物质的受激辐射过程遵守宇称守恒，受激辐射产生的两光子态有宇称，是迭加纠缠态。这样的两个纠缠光子经过平行平面谐振腔的作用，再通过受激辐射，不断重复这个过程，最终产生多光子纠缠。 本文主要结果和结论是：有宇称的物质的受激辐射产生多光子纠缠态。激光器物质的电子态如有宇称，则激光器谐振腔内（平行平面腔）的受激辐射产生的多光子态是纠缠态，并可从对称结构的双向单模激光器输出。 理论给出多光子纠缠的表示式。研制成一台对称结构双向输出单模He-Ne激光器，进行了多光子纠缠态的实验验证，实验结果与理论预期相符。
分类： 光学 >> 量子光学 提交时间： 2023-02-25
摘要： In this letter, we present a simple and new idea to generate two types of novel integrable multi-L\'evy-index and mix-L\'evy-index (mixed) fractional nonlinear soliton hierarchies, containing multi-index and mixed fractional higher-order nonlinear Schr\"odinger (NLS) hierarchy, fractional complex modified Korteweg-de Vries (cmKdV) hierarchy, and fractional mKdV hierarchy. Their explicit forms can be given using the completeness of squared eigenfunctions. Moreover, we present their anomalous dispersion relations via their linearizations, and fractional multi-soliton solutions via the inverse scattering transform with matrix Riemann-Hilbert problems. These obtained fractional multi-soliton solutions may be useful to understand the related super-dispersion transports of nonlinear waves in multi-index fractional nonlinear media.
分类： 光学 >> 量子光学 提交时间： 2023-02-25
摘要： Optical focusing through scattering media has important implications for optical applications in medicine, communications, and detection. In recent years, many wavefront shaping methods have been successfully applied to the field, among which the population optimization algorithm has achieved remarkable results. However, the current population optimization algorithm has some drawbacks: 1. the offspring do not fully inherit the good genes from the parent. 2. more efforts are needed to tune the parameters. In this paper, we propose the mutate greedy algorithm. It combines greedy strategies and real-time feedback of mutation rates to generate offspring. In wavefront shaping, people can realize high enhancement and fast convergence without a parameter-tuning process.
分类： 光学 >> 量子光学 提交时间： 2023-02-25
摘要： We study the open XXZ spin chain with a PT-symmetric non-Hermitian boundary field. We find an interaction-induced scale-free non-Hermitian skin effect by using the coordinate Bethe ansatz. The steady state and the ground state in the PT broken phase are constructed, and the formulas of their eigen-energies in the thermodynamic limit are obtained. The differences between the many-body scale-free states and the boundary string states are explored, and the transition between the two at isotropic point is investigated. We also discuss an experimental scheme to verify our results.
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