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arXiv 1609.06558quant-phcond-mat.stat-mech
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Ising自旋玻璃的非随机哈密顿量和量子退火

Nonstoquastic Hamiltonians and Quantum Annealing of an Ising Spin Glass

L. Hormozi, E. W. Brown, G. Carleo, M. Troyer

摘要:

我们研究了量子退火机性能中的哈密顿复杂性的作用。我们考虑两个一般类的退火哈密顿:随机的,这可以有效地使用量子蒙特卡罗算法模拟,和nonstoquastic的,这不能有效地处理。我们实现了后者通过添加反铁磁耦合的双自旋驱动程序项,传统上研究的横向场伊辛模型,并比较其性能与类似的随机哈密顿铁磁耦合的附加条款。我们专注于远程伊辛自旋玻璃作为我们的问题哈密顿量的模型,并进行退火机之间的比较,通过数值计算他们的成功概率,在解决随机情况下的问题哈密顿量的系统高达17个自旋。我们发现,对于一小部分更难的情况下,nonstoquastic哈密顿大大优于他们的stoquastic同行和他们的优势持续系统规模的增长。我们猜想,所观察到的改善性能是密切相关的非随机哈密顿的挫折性质。

英文摘要:

We study the role of Hamiltonian complexity in the performance of quantum annealers. We consider two general classes of annealing Hamiltonians: stoquastic ones, which can be simulated efficiently using the quantum Monte Carlo algorithm, and nonstoquastic ones, which cannot be treated efficiently. We implement the latter by adding antiferromagnetically coupled two-spin driver terms to the traditionally studied transverse-field Ising model, and compare their performance to that of similar stoquastic Hamiltonians with ferromagnetically coupled additional terms. We focus on a model of long-range Ising spin glass as our problem Hamiltonian and carry out the comparison between the annealers by numerically calculating their success probabilities in solving random instances of the problem Hamiltonian in systems of up to 17 spins. We find that, for a small percentage of mostly harder instances, nonstoquastic Hamiltonians greatly outperform their stoquastic counterparts and their superiority persists as the system size grows. We conjecture that the observed improved performance is closely related to the frustrated nature of nonstoquastic Hamiltonians.

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