Consistency tests of classical and quantum models for a quantum annealer
Consistency tests of classical and quantum models for a quantum annealer
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DOI：
10.1103/physreva.91.042314
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发表时间：
2015-04-13
影响因子：
2.9
通讯作者：
Lidar, Daniel A.
中科院分区：
文献类型：
--
作者：
Albash, Tameem;Vinci, Walter;Lidar, Daniel A.
最近，D-Wave处理器是否表现出大规模量子行为或是否可以用经典模型描述的问题引起了人们的极大兴趣。在这项工作中，我们通过研究“黑盒”模型中的503量子比特D波二设备来解决这个问题，即，通过研究它的输入输出行为。我们的工作概括了Boixo等人[Nat. Commun. 4，2067（2013）]，并使用多达20个量子比特的组来实现具有基态简并的横向伊辛模型演化，其分布充当区分D-Wave器件的经典模型和量子模型的敏感探针。我们的研究结果排除了迄今为止提出的所有经典模型，并提供证据表明，从量子化能级结构开始的设备的开放系统量子动力学描述是合理的，即使在存在相关的热激发和一个小的值的单量子位退相干时间的退火时间的比率。
Recently the question of whether the D-Wave processors exhibit large-scale quantum behavior or can be described by a classical model has attracted significant interest. In this work we address this question by studying a 503-qubitD-Wave Two device in the "black box" model i.e., by studying its input-output behavior. Our work generalizes an approach introduced in Boixo et al. [Nat. Commun. 4, 2067 (2013)] and uses groups of up to 20 qubits to realize a transverse Ising model evolution with a ground-state degeneracy whose distribution acts as a sensitive probe that distinguishes classical and quantum models for the D-Wave device. Our findings rule out all classical models proposed to date for the device and provide evidence that an open-system quantum dynamical description of the device that starts from a quantized energy level structure is well justified, even in the presence of relevant thermal excitations and a small value of the ratio of the single-qubit decoherence time to the annealing time.