论文标题
从弱环境耦合到跨界策略中的耗散Landau-Zener隧道
Dissipative Landau-Zener tunneling in the crossover regime from weak to strong environment coupling
论文作者
论文摘要
Landau-Zener Tunneling描述了在抗横断过程中进行两级系统中的过渡，是一种适用于广泛物理现象的模型。逼真的量子系统受到耗散的影响，这是由于与其环境的耦合所致。理解这种开放量子系统的一个重要方面是系统本身的相对能量尺度和系统 - 环境耦合，从而区分了弱耦合方案。使用可调的超导通量Qubit，我们观察到从弱耦合到强烈耦合到Landau-Zener隧道环境的交叉。我们的结果证实了先前关于弱和强耦合限制中耗散的Landau-Zener隧道的理论研究。我们设计了一个自旋浴模型，可有效捕获交叉状态。这项工作与理解耗散在量子退火中的作用有关，该系统预计该系统将在达到目标状态之前经过一系列Landau-Zener的过渡。
Landau-Zener tunneling, which describes the transition in a two-level system during a sweep through an anti-crossing, is a model applicable to a wide range of physical phenomena. Realistic quantum systems are affected by dissipation due to coupling to their environments. An important aspect of understanding such open quantum systems is the relative energy scales of the system itself and the system-environment coupling, which distinguishes the weak- and strong-coupling regimes. Using a tunable superconducting flux qubit, we observe the crossover from weak to strong coupling to the environment in Landau-Zener tunneling. Our results confirm previous theoretical studies of dissipative Landau-Zener tunneling in the weak and strong coupling limits. We devise a spin bath model that effectively captures the crossover regime. This work is relevant for understanding the role of dissipation in quantum annealing, where the system is expected to go through a cascade of Landau-Zener transitions before reaching the target state.
