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arXiv 2203.01619nucl-thquant-ph
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自适应变分量子算法求解原子核结构问题

Solving Nuclear Structure Problems with the Adaptive Variational Quantum Algorithm

A. M. Romero, J. Engel, Ho Lun Tang, Sophia E. Economou

摘要:

本文利用Lipkin-Meshkov-Glick(LMG)模型和价空间核壳层模型研究了核结构理论中的变分量子本征求解器的可能性能。LMG模型表现出相变和自发对称性破缺在平均场水平的一个阶段,在中等质量和重核的集体动力学的特征。我们表明,通过适当的修改,ADAPT-VQE算法,一个特别灵活和准确的变分方法,不受这些并发症的困扰。我们处理多达12个粒子,并表明接近基态能量所需的量子操作的数量与量子比特的数量呈线性关系。我们发现类似的缩放时,该算法被应用到核壳模型与现实的相互作用在$sd$和$pf$壳。虽然大多数这些模拟不包含噪声,我们使用的噪声模型从真正的IBM硬件表明,对于LMG模型与四个粒子,弱噪声对算法的效率没有影响。

英文摘要:

We use the Lipkin-Meshkov-Glick (LMG) model and the valence-space nuclear shell model to examine the likely performance of variational quantum eigensolvers in nuclear-structure theory. The LMG model exhibits both a phase transition and spontaneous symmetry breaking at the mean-field level in one of the phases, features that characterize collective dynamics in medium-mass and heavy nuclei. We show that with appropriate modifications, the ADAPT-VQE algorithm, a particularly flexible and accurate variational approach, is not troubled by these complications. We treat up to 12 particles and show that the number of quantum operations needed to approach the ground-state energy scales linearly with the number of qubits. We find similar scaling when the algorithm is applied to the nuclear shell model with realistic interactions in the $sd$ and $pf$ shells. Although most of these simulations contain no noise, we use a noise model from real IBM hardware to show that for the LMG model with four particles, weak noise has no effect on the efficiency of the algorithm.

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