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arXiv 2209.12166quant-phcond-mat.dis-nnphysics.comp-ph
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D波量子退火中嵌入引起的链强度的测定

Determination of Chain Strength induced by Embedding in D-Wave Quantum Annealer

Hunpyo Lee

摘要:

D波量子退火器需要嵌入由几个量子位连接的铁磁(FM)链,因为它无法捕获量子位之间的精确远程耦合,并保留取决于硬件类型的特定架构。因此,确定维持链中量子位的FM阶所需的链强度$J_c$对于量子退火的准确性至关重要。在这项研究中,我们设计了组合优化问题,有序和无序的量子比特的各种嵌入,以预测适当的$J_c$值。利用精确方法分别分析了无链和有链组合优化问题中基态和第一激发态之间的能量间隔$Δ_s$和$Δ_c$。我们还测量了概率$p$,每个站点$E_g$的确切的地面能量观察到在许多模拟退火镜头。我们证明了在组合优化问题中,随着量子比特无序度的增加,$J_c$的确定变得越来越敏感。此外,适当的$J_c$的值(其中$p$的值处于最大值)随着$Δ_s$的减小而增大。最后,适当的值$J_c$被证明是观察到约$Δ_c/Δ_s=0.25$和$2.1 E_g$在有序和无序量子比特,分别。

英文摘要:

The D-wave quantum annealer requires embedding with ferromagnetic (FM) chains connected by several qubits, because it cannot capture exact long-range coupling between qubits, and retains the specific architecture that depends on the hardware type. Therefore, determination of the chain strength $J_c$ required to sustain FM order of qubits in the chains is crucial for the accuracy of quantum annealing. In this study, we devise combinatorial optimization problems with ordered and disordered qubits for various embeddings to predict appropriate $J_c$ values. We analyze the energy interval $Δ_s$ and $Δ_c$ between ground and first excited states in the combinatorial optimization problems without and with chains respectively, using the exact approach. We also measure the probability $p$ that the exact ground energy per site $E_g$ is observed in many simulated annealing shots. We demonstrate that the determination of $J_c$ is increasingly sensitive with growing disorder of qubits in the combinatorial optimization problems. In addition, the values of appropriate $J_c$, where the values of $p$ are at a maximum, increase with decreasing $Δ_s$. Finally, the appropriate value of $J_c$ is shown to be observed at approximately $Δ_c/Δ_s=0.25$ and $2.1 E_g$ in the ordered and disordered qubits, respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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