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arXiv 2406.03364quant-phcond-mat.mtrl-scicond-mat.str-elphysics.comp-ph
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D-Wave量子退火器中由嵌入确定的最优链耦合

Determination of Optimal Chain Coupling made by Embedding in D-Wave Quantum Annealer

Hayun Park, Hunpyo Lee

AI总结:

针对D-Wave量子退火器中默认链耦合非最优导致测量精度降低的问题,提出一种确定最优链耦合$J_c^{\ ext{optimal}}$的算法,以最大化观测最低能量的概率,并在多种组合优化问题上验证了其优于默认耦合的性能。

摘要:

D-wave量子退火器(D-wave QA)中的量子比特被设计在Pegasus图上,这与组合优化问题的结构不同。这种情况需要通过量子比特之间的铁磁(FM)耦合$J_c$连接的链进行嵌入。弱和强的$J_c$值分别会导致链断裂和链能量的强制执行,这会降低量子退火(QA)测量的准确性。此外,我们确认,即使D-Wave Ocean包提供了默认耦合$J_c^{\ ext{default}}$,它也不是使QA测量的可能正确率最大化的最优耦合$J_c^{\ ext{optimal}}$。在本文中,我们提出了一种算法,用于确定如何以最大概率$p$观察到可能的最低能量来确定$J_c^{\ ext{optimal}}$。最后,我们确认,在受挫和全连接组合优化问题的各种参数的QA测量中,提取的$J_c^{\ ext{optimal}}$显示出比$J_c^{\ ext{default}}$更好的$p$。开放代码可在\ extit{https://github.com/HunpyoLee/OptimizeChainStrength}获取。

英文摘要:

The qubits in a D-wave quantum annealer (D-wave QA) are designed on a Pegasus graph that is different from structure of a combinatorial optimization problem. This situation requires embedding with the chains connected by ferromagnetic (FM) coupling $J_c$ between the qubits. Weak and strong $J_c$ values induce chain breaking and enforcement of chain energy, which reduce the accuracy of quantum annealing (QA) measurements, respectively. In addition, we confirmed that even though the D-Wave Ocean package provides a default coupling $J_c^{\text{default}}$, it is not an optimal coupling $J_c^{\text{optimal}}$ that maximizes the possible correct rate of QA measurements. In this paper, we present an algorithm how $J_c^{\text{optimal}}$ with the maximum probability $p$ for observing the possible lowest energy is determined. Finally, we confirm that the extracted $J_c^{\text{optimal}}$ show much better $p$ than $J_c^{\text{default}}$ in QA measurements of various parameters of frustrated and fully connected combinatorial optimization problems. The open code is available in \textit{https://github.com/HunpyoLee/OptimizeChainStrength}.

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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