20.500.12556/RUL-155596 Dynamics of magnetization at infinite temperature in a Heisenberg spin chain Understanding universal aspects of quantum dynamics is an unresolved problem in statistical mechanics. In particular, the spin dynamics of the one-dimensional Heisenberg model were conjectured as to belong to the Kardar-Parisi-Zhang (KPZ) universality class based on the scaling of the infinite-temperature spin-spin correlation function. In a chain of 46 superconducting qubits, we studied the probability distribution of the magnetization transferred across the chain’s center, $P(\mathscr{M})$. The first two moments of $P(\mathscr{M})$ show superdiffusive behavior, a hallmark of KPZ universality. However, the third and fourth moments ruled out the KPZ conjecture and allow for evaluating other theories. Our results highlight the importance of studying higher moments in determining dynamic universality classes and provide insights into universal behavior in quantum systems. quantum physics transport phenomena Heisenberg spin chains statistical mechanics magnetization kvantna fizika transportni pojavi Heisenbergove spinske verige statistična mehanika magnetizacija true false true Angleški jezik Slovenski jezik Članek v reviji 2024-04-08 09:18:21 2024-04-08 09:18:22 2024-04-09 03:46:01 0000-00-00 00:00:00 2024 0 0 Str. 48–53 no. 6691 Vol. 384 2024 0000-00-00 PostprintKoncna NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2024-04-04 530.145 0036-8075 10.1126/science.adi7877 191659011 2306.09333.pdf 2306.09333.pdf 1 B4FA7A50006B4001DE8E4C6B91702BF0 aa60bdbb8e3d147be35517d62e36a1811fd46a58c77bb0d81517119cd56b18f8 457d500d-f57b-11ee-937a-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=182561 https://www.science.org/doi/10.1126/science.adi7877 0 4e1b100f-f57b-11ee-937a-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=182562 Fakulteta za matematiko in fiziko 0 0 0