Quantum simulation of Landau-Zener model dynamics supporting the Kibble-Zurek mechanism.
Quantum simulation of Landau-Zener model dynamics supporting the Kibble-Zurek mechanism.
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DOI：
10.1103/physrevlett.112.035701
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发表时间：
2013-01
影响因子：
8.6
通讯作者：
Xiao-Ye Xu;Yongjian Han;Kai Sun;Jin-Shi Xu;Jian-Shun Tang;Chuan‐Feng Li;G. Guo
中科院分区：
文献类型：
--
作者：
Xiao-Ye Xu;Yongjian Han;Kai Sun;Jin-Shi Xu;Jian-Shun Tang;Chuan‐Feng Li;G. Guo
Kibble-Zurek机制（KZM）捕获了二阶相变非平衡动力学的关键物理，并准确地预测了在此过程中形成的拓扑缺陷的密度。然而，KZM的中心预测——即缺陷密度随猝灭速率的成比例——仍然需要进一步的实验证实，特别是对于量子跃迁。本文采用0.975±0.008的九级光学干涉仪对Landau-Zener模型的非平衡动力学进行了量子模拟。结果支持绝热脉冲近似，这是Kibble-Zurek理论的核心。此外，所研制的高保真多级光学干涉仪可以支持更复杂的线性光学量子模拟。
The Kibble-Zurek mechanism (KZM) captures the key physics of nonequilibrium dynamics in second order phase transitions, and accurately predicts the density of topological defects formed in such processes. However, the central prediction of KZM--i.e., the scaling of the density of defects with the quench rate--still needs further experimental confirmation, particularly for quantum transitions. Here, we perform a quantum simulation of the nonequilibrium dynamics of the Landau-Zener model based on a nine-stage optical interferometer with an overall visibility of 0.975±0.008. The results support the adiabatic-impulse approximation, which is the core of Kibble-Zurek theory. Moreover, the developed high-fidelity multistage optical interferometer can support more complex linear optical quantum simulations.