论文标题
驱动的一维嘈杂Kitaev链
Driven one-dimensional noisy Kitaev chain
论文作者
论文摘要
我们研究了由各向异性参数驱动的一维基塔伊夫链,$ j _ { - } = t/τ_q$,在参数$ j _ {+} $中存在弱高斯噪声的情况下。该系统是在最初的$ t \ rightarrow -\ infty $的最初时间以汉密尔顿人的基础制备。驱动方案末尾的缺陷密度和残余能量揭示了反kibble Zurek(AKZ)行为,该行为偏离了较早报道的淬灭时间依赖性缺陷密度的线性。发现协议结束时的熵密度显示出AKZ行为的特征。在Kitaev链的背景下,两点自旋相关器的短距离。跨量子相变点的隐藏拓扑顺序是通过非本地字符串顺序参数探测的。在噪声驱动器协议末尾,在最终的分解状态中计算的两点Majoraana相关器和隐藏的字符串相关器与AKZ图片一致。我们已经分析了双自旋空间中的扭结统计数据,嘈杂驱动器末端的前三个累积物也显示出类似于缺陷密度的较慢的扫描的AKZ缩放行为。扭结分布函数与正态分布相近,其依赖性均值和方差为正态分布。
We study one-dimensional Kitaev chain driven by the anisotropy parameter, $J_{-}= t/τ_Q$, in the presence of weak Gaussian noise in the parameter $J_{+}$. The system is prepared in the ground state of the Hamiltonian at the initial time $t\rightarrow -\infty$. The defect density and the residual energy at the end of the drive protocol reveals anti-Kibble Zurek (AKZ) behavior which deviates from the earlier reported linear in quench time dependence for the defect density. The entropy density at the end of the protocol is found to exhibit the signature of the AKZ behavior. In the context of the Kitaev chain, the two-point spin correlators are short ranged. The hidden topological order across the quantum phase transition point is probed via the non-local string order parameters. The two-point Majorana correlator and the hidden string correlator calculated in the final decohered state at the end of the noisy drive protocol is consistent with the AKZ picture. We have analyzed the kink statistics in the dual spin space, the first three cumulants at the end of the noisy drive also exhibit the AKZ scaling behavior for slower sweeps similar to the defect density. The kink distribution function is well approximated with the normal distribution with non-universal noise dependent mean and variance.