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arXiv 2006.02539quant-ph
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用非对角级数展开模拟哈密顿动力学的量子算法

Quantum Algorithm for Simulating Hamiltonian Dynamics with an Off-diagonal Series Expansion

Amir Kalev, Itay Hen

摘要:

我们提出了一个有效的量子算法来模拟一般哈密顿系统的动力学。我们的技术是基于幂级数展开的时间演化算子在其非对角项。该扩展将由于哈密顿量的对角分量而产生的动力学从其非对角部分产生的动力学中分离出来,我们使用酉技术的线性组合对其进行编码。我们的方法有一个最佳的依赖所需的精度,正如我们所示,一般需要比当前国家的最先进的资源少得多。我们提供了几个样本模型的资源成本分析。

英文摘要:

We propose an efficient quantum algorithm for simulating the dynamics of general Hamiltonian systems. Our technique is based on a power series expansion of the time-evolution operator in its off-diagonal terms. The expansion decouples the dynamics due to the diagonal component of the Hamiltonian from the dynamics generated by its off-diagonal part, which we encode using the linear combination of unitaries technique. Our method has an optimal dependence on the desired precision and, as we illustrate, generally requires considerably fewer resources than the current state-of-the-art. We provide an analysis of resource costs for several sample models.

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