非周期时间系综中的矩选择性量子设计
Moment-Selective Quantum Designs in Aperiodic Temporal Ensembles
- California State University, Northridge(北岭加州州立大学)
- California Institute of Technology(加州理工学院)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
本文提出一种利用分层非周期驱动设计矩选择性量子时间系综的机制,在对称约束下实现低阶Haar统计与高阶偏差共存,并给出可观测的有限时间特征。
AI中文摘要:
我们引入了一种通用机制,用于设计具有分层结构非周期驱动的矩选择性时间设计。在特殊控制设置下,当驱动动力学受有限对称群约束时,低阶矩已经可以再现Haar统计,而选定的高阶偏差仍保持非零。从这种设置进行小的静态失谐通常会产生指数长的寿命,其指数与失谐的平方成反比。我们通过精确的斐波那契和银平均构造,在四元数系和二十面体共振下,在量子比特系统中展示了这一机制,其中首个保留的非Haar矩分别出现在第3阶和第6阶。我们进一步表明,随机控制波动产生的截止与相干失谐在性质上不同。最后,我们提出了一种有限时间特征,用于测量长寿命矩,而无需在指数长时间内进行观测。
英文摘要:
We introduce a general mechanism for engineering moment-selective temporal designs with hierarchically structured aperiodic drives. At special control settings where the driven dynamics is constrained by a finite symmetry group, lower-order moments can already reproduce Haar statistics while a selected higher-order deviation remains nonzero. A small static detuning from such a setting generically produces an exponentially long lifetime whose exponent scales inversely with the square of the detuning. We illustrate this mechanism in qubit systems through exact Fibonacci and silver-mean constructions with tetrahedral and icosahedral resonances, for which the first retained non-Haar moments occur at orders $3$ and $6$, respectively. We further show that stochastic control fluctuations produce a qualitatively different cutoff from coherent detuning. Finally, we propose a finite-time signature of the long-lived moment that can be measured without requiring observations over exponentially long times.