arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2504.03435quant-phcond-mat.stat-mechhep-thmath-phmath.MP
收藏

通用算子增长的可精确求解模型

Exactly solvable models for universal operator growth

Oleksandr Gamayun, Murtaza Ali Mir, Oleg Lychkovskiy, Zoran Ristivojevic

AI总结:

本文提出与通用算子增长假设一致的Lanczos系数族,实现可精确求解的动力学,并精确计算了其中一个族的Krylov复杂度。

摘要:

通用多体系统的量子可观测量在算子的Krylov空间中表现出一种普遍的增长模式。这种模式在Lanczos基中尤为明显,此时演化超算子呈现三对角形式。根据通用算子增长假设,超算子的非零元素(即Lanczos系数)渐近地线性增长。我们引入并探索了与通用算子增长一致且导致动力学可精确求解的广泛Lanczos系数族。在这些族中,Lanczos序列渐近展开的次领头项可以被控制并精细调节,以产生多样化的动力学模式。对于其中一个族,我们精确计算了Krylov复杂度。

英文摘要:

Quantum observables of generic many-body systems exhibit a universal pattern of growth in the Krylov space of operators. This pattern becomes particularly manifest in the Lanczos basis, where the evolution superoperator assumes the tridiagonal form. According to the universal operator growth hypothesis, the nonzero elements of the superoperator, known as Lanczos coefficients, grow asymptotically linearly. We introduce and explore broad families of Lanczos coefficients that are consistent with the universal operator growth and lead to the exactly solvable dynamics. Within these families, the subleading terms of asymptotic expansion of the Lanczos sequence can be controlled and fine-tuned to produce diverse dynamical patterns. For one of the families, the Krylov complexity is computed exactly.

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。

↑