论文标题
诊断量订购的量子混乱在踢脚模型中诊断
Diagnosing quantum chaos with out-of-time-ordered-correlator quasiprobability in the kicked-top model
论文作者
论文摘要
尽管经典的混乱已经成功地以一致的理论和直观技术(例如使用Lyapunov指数的使用)来表征,但量子混乱仍然知之甚少,以及与多目标纠缠和信息争夺的关系。我们考虑了一个基准系统,即踢顶模型,该模型在经典版本中显示混乱的行为,并继续对量子案例进行表征,并及时彻底诊断出混乱和纠缠的生长。作为表征量子混乱的新工具,我们为此范围介绍了超时订购的相关器(OTOC)背后的准概率分布。我们计算此分布的累积非经典性,已经证明,该分布的表现优于简单使用OTOC作为探针,以区分可集成和不可融合的哈密顿量。为了提供彻底的比较分析,我们将非经典性的行为与纠缠措施(例如哈密顿官和纠缠熵的三方共同信息)进行了对比。我们发现,在经典的踢脚模型中,最初状态将位于“混乱之海”的系统,随着时间的流逝,它们与混乱行为相关的特征和封闭量子系统中的纠缠产生相关的特征。我们通过使用这种新型基于OTOC的测量来捕获这种迹象来证实这种迹象。
While classical chaos has been successfully characterized with consistent theories and intuitive techniques, such as with the use of Lyapunov exponents, quantum chaos is still poorly understood, as well as its relation with multi-partite entanglement and information scrambling. We consider a benchmark system, the kicked top model, which displays chaotic behaviour in the classical version, and proceed to characterize the quantum case with a thorough diagnosis of the growth of chaos and entanglement in time. As a novel tool for the characterization of quantum chaos, we introduce for this scope the quasi-probability distribution behind the out-of-time-ordered correlator (OTOC). We calculate the cumulative nonclassicality of this distribution, which has already been shown to outperform the simple use of OTOC as a probe to distinguish between integrable and nonintegrable Hamiltonians. To provide a thorough comparative analysis, we contrast the behavior of the nonclassicality with entanglement measures, such as the tripartite mutual information of the Hamiltonian as well as the entanglement entropy. We find that systems whose initial states would lie in the "sea of chaos" in the classical kicked-top model, exhibit, as they evolve in time, characteristics associated with chaotic behavior and entanglement production in closed quantum systems. We corroborate this indication by capturing it with this novel OTOC-based measure.