标题： 自旋-玻色模型中的量子退火：从微扰到超强介导耦合 显示英文标题

标题： Quantum annealing in spin-boson model: from a perturbative to a ultrastrong mediated coupling

摘要： 我们研究了一种量子退火机，其中玻色子介导了量子比特之间的伊辛型相互作用。 我们比较了直接耦合和介导耦合下基态制备的效率，分别使用了伊辛哈密顿量和自旋-玻色子哈密顿量。 这种比较是在一个小的受挫反铁磁体上进行的数值计算，选择了一个最优的绝热路径，以揭示玻色子介导相互作用的特性。 这些特性可以通过考虑所谓的激发解来解释：具有与基态相同自旋关联但具有更大玻色子占据的状态。 当玻色子和量子比特的频率相似时，量子退火的性能取决于激发解如何与局部自旋错误交换人口。 我们在某些情况下报告了由于这种交换导致的量子退火性能提升。 显示英文摘要

摘要： We study a quantum annealer where bosons mediate the Ising-type interactions between qubits. We compare the efficiency of ground state preparation for direct and mediated couplings, for which Ising and spin-boson Hamiltonian are employed respectively. This comparison is done numerically for a small frustrated antiferromagnet, with a careful choice of the optimal adiabatic passage that reveals the features of the boson-mediated interactions. Those features can be explained by taking into account what we called excited solutions: states with the same spin correlations as the ground-state but with a larger bosonic occupancy. For similar frequencies of the bosons and qubits, the performance of quantum annealing depends on how excited solutions interchange population with local spin errors. We report an enhancement of quantum annealing thanks to this interchange under certain circumstances.