探测非科尔摩戈罗夫-阿诺德-莫泽系统的动态灵敏度,通过时间外顺序的相关系数
Naga Dileep Varikuti1, Abinash Sahu1, Arul Lakshminarayan1
1Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India and Center for Quantum Information, Communication and Computation, Indian Institute of Technology Madras, Chennai 600036, India.
这项研究使用量子系统来探索混沌,发现共振条件大大改变了动态,导致共振时的超时序相关系数 (OTOC) 的二次增长.
科学领域:
- 这是量子混沌.
- 非科尔摩戈罗夫-阿诺德-莫泽尔 (KAM) 系统
- 统计力学 统计力学
背景情况:
- 非KAM系统在受到时间依赖场所的影响时,通过破裂相位空间 tori 呈现出快速的经典混乱.
- 在随机网络中,阿诺德的扩散促进了像量子动波器 (KHO) 这样的系统中的大规模相位空间扩散.
- 在共振时接近零的Lyapunov指数表明弱混沌,尽管有显著的经典相位空间结构变化.
研究的目的:
- 为了研究在近共振条件下扰乱的非KAM系统的量子动态灵敏度.
- 在共振与非共振模式中分析时间外顺序相关器 (OTOC) 的行为.
- 为了将量子力学与经典相位空间结构变化的对比.
主要方法:
- 利用时间外顺序相关器 (OTOC) 来探测量子极限中的动态灵敏度.
- 采用了一种量子化动波器 (KHO) 模型,展示了随机网络.
- 慢慢地改变了共振条件参数,并分析了在和远离共振的OTOC.
主要成果:
- 在共振时观察到长期OTOC动态的二次增长,与非共振病例的线性或停滞增长形成对比.
- 短期的OTOC动态显示出相对稳定的指数级增长,与不稳定的固定点一致.
- 数字发现得到了特定案例的分析推导的支持.
结论:
- 响应条件显著影响量子动力学,导致明显的OTOC增长模式.
- OTOC有效地捕捉了对相位空间结构变化的动态灵敏度,即使在弱混沌系统中也是如此.
- 关于非共振病例的发现适用于更广泛的一类近集成的KAM系统.
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