We propose a modified quantum annealing protocol, i. e., pulsed quantum annealing} (PQA), in order to increase the success probability by a pulse application during the quantum annealing process. It is well known that the success probability of the conventional quantum annealing is reduced due to the Landau-Zener transitions. By applying a pulse to the system, we modulate the success probability and increase it, compared to the conventional quantum annealing, by optimizing the pulse parameters. We demonstrate our findings for a single qubit both numerically and analytically. The analytical model is based on the tranfer matrix approach and it is in good agreement with the full numerical results. We also investigate the PQA protocol for multi-qubit cases $i. e.,$ random spin-glass instances, and we present an overall increase of the success probability over the conventional quantum annealing, by optimizing the pulse parameters. Our results indicate that PQA can be used to design future high-performance quantum annealing machines, especially for hard instances that the conventional QA protocol behaves poorly.

中文翻译：

---

脉冲量子退火

我们提出了一种改进的量子退火协议，即脉冲量子退火}（PQA），以便在量子退火过程中通过脉冲应用增加成功概率。众所周知，由于朗道-齐纳跃迁，常规量子退火的成功概率降低。通过向系统施加脉冲，我们通过优化脉冲参数来调制成功概率并与传统的量子退火相比增加成功概率。我们在数值和分析上展示了我们对单个量子位的发现。解析模型基于传递矩阵方法，与完整的数值结果吻合良好。我们还研究了多量子位案例的 PQA 协议 $ie,$ 随机自旋玻璃实例，通过优化脉冲参数，我们提出了比传统量子退火成功概率的整体增加。我们的结果表明 PQA 可用于设计未来的高性能量子退火机，特别是对于传统 QA 协议表现不佳的硬实例。