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arXiv 2407.09770quant-ph
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连续变量系统中拓扑相变的测量方案

Scheme for measuring topological transitions in a continuous variable system

Bi-Yao Wang, Hao-Long Zhang, Shou-Bang Yang, Fan Wu, Zhen-Biao Yang, Shi-Biao Zheng

AI总结:

本研究提出一种测量双光子驱动、单光子调制的克尔非线性谐振器拓扑性质的方案,通过观测Berry曲率与第一陈数揭示拓扑特性,利用猫态基矢构建的参数流形识别拓扑相变,为介观连续变量系统的拓扑研究提供新视角。

摘要:

我们提出了一种测量受单光子调制的双光子驱动克尔非线性谐振器(Kerr-nonlinear resonator, KNR)拓扑性质的方案。通过观测Berry曲率以及由此得到的第一陈数——即物理可观测量对调制驱动控制参数变化率的非绝热响应——来揭示其拓扑性质。该系统的哈密顿量决定了其在以偶、偶猫态为两个基矢张成的态空间中受约束的动力学,由该哈密顿量构建的参数流形经过调整,使得穿过流形的简并点标志着拓扑相变。该方案在介观系统中采用此类连续变量态,为探索复杂系统的几何结构及相关拓扑性质提供了新视角。

英文摘要:

We propose a scheme for measuring topological properties in a two-photon-driven Kerr-nonlinear resonator (KNR) subjected to a single-photon modulation. The topological properties are revealed through the observation of the Berry curvature and hence the first Chern number, as a nonadiabatic response of the physical observable to the change rate of the control parameter of the modulated drive. The parameter manifold, constructed from the system's Hamiltonian that determines its dynamics constrained in the state space spanned by the even and odd cat states as two basis states, is adjusted so that the degeneracy crossing the manifold indicates a topological transition. The scheme, with such continuous variable states in mesoscpic systems, provides a new perspective for exploration of the geometry and the related topology with complex systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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