Signatures of Open and Noisy Quantum Systems in Single-Qubit Quantum Annealing
Signatures of Open and Noisy Quantum Systems in Single-Qubit Quantum Annealing
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DOI：
10.1103/physrevapplied.19.034053
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发表时间：
2022-08
影响因子：
4.6
通讯作者：
Zachary Morrell;Marc Vuffray;A. Lokhov;Andreas Bartschi;T. Albash;Carleton Coffrin
中科院分区：
文献类型：
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作者：
Zachary Morrell;Marc Vuffray;A. Lokhov;Andreas Bartschi;T. Albash;Carleton Coffrin
我们提出了一种量子退火协议，可以更有效地探测 D-Wave 量子退火硬件上单个量子位的动态。该协议使用 D-Wave 的 h 增益计划功能，允许在退火过程中的任意点快速淬灭纵向磁场。这一功能使我们能够区分开放和封闭系统动力学以及纵向磁场噪声的存在或不存在。我们表明，热场和磁场波动都是关键的噪声源，需要将其包含在开放量子系统模型中以重现硬件的输出统计数据。
We propose a quantum annealing protocol that more effectively probes the dynamics of a single qubit on D-Wave's quantum annealing hardware. This protocol uses D-Wave's h-gain schedule functionality, which allows the rapid quenching of the longitudinal magnetic field at arbitrary points during the anneal. This features enables us to distinguish between open and closed system dynamics as well as the presence or absence of longitudinal magnetic field noise. We show that both thermal and magnetic field fluctuations are key sources of noise that need to be included in an open quantum system model to reproduce the output statistics of the hardware.