Three phases of quantum annealing: Fast, slow, and very slow
Three phases of quantum annealing: Fast, slow, and very slow
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DOI：
10.1103/physreva.105.042423
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发表时间：
2021-12
影响因子：
2.9
通讯作者：
Artur Soriani;Pierre Nazé;Marcus V. S. Bonança;Bartłomiej Gardas;S. Deffner
中科院分区：
文献类型：
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作者：
Artur Soriani;Pierre Nazé;Marcus V. S. Bonança;Bartłomiej Gardas;S. Deffner
目前，现有的量子退火炉已经被证明是在噪声-中尺度量子时代首次实际应用的可行技术。然而，为了充分利用它们的能力，全面表征它们的有限时间激励是有帮助的。为此，我们为驱动的Ising链开发了一个阶段图，从中可以读出多余工作的缩放行为作为过程持续时间和系统大小的函数。Kibble-Zurek机制很好地描述了“快速”过程；“缓慢”过程由有效的朗道-齐纳动力学控制；“非常慢”的过程可以用绝热微扰理论来近似。
Currently, existing quantum annealers have proven themselves as viable technology for the first practical applications in the noisy-intermediate-scale-quantum era. However, to fully exploit their capabilities, a comprehensive characterization of their finite-time excitations is instrumental. To this end, we develop a phase diagram for driven Ising chains, from which the scaling behavior of the excess work can be read off as a function of process duration and system size."Fast"processes are well described by the Kibble-Zurek mechanism;"slow"processes are governed by effective Landau-Zener dynamics; and"very slow"processes can be approximated with adiabatic perturbation theory.