里德伯原子介导的分子阵列中的强反对称自旋交换

中文摘要 AI 辅助

超冷分子系统近来已成为量子计算与模拟的多功能平台。由分子直接偶极相互作用产生的自旋交换相互作用是生成量子纠缠和模拟量子自旋模型的关键机制。然而，相对较小的电偶极矩导致自旋交换耦合较弱，从根本上限制了量子信息处理的速度和多体动力学相互作用的循环周期。在此，我们引入一个框架，利用具有大电偶极矩的里德伯原子来介导光镊阵列中分子之间的强相互作用，该框架能够实现对里德伯原子和分子的单独激光寻址。我们的结果表明，介导耦合可以实现具有内在Dzyaloshinskii-Moriya特征的有效分子自旋交换相互作用，其中里德伯原子与分子自由度动态解耦，有效相互作用强度增强了多达三个数量级。我们进一步通过快速纠缠生成、高保真双量子比特门操作以及具有长寿命边缘相干性的非平衡对称性保护拓扑相的实现来展示其多功能性。我们的工作为强分子自旋相互作用开辟了道路，并为在超冷分子的光镊阵列中实现快速、可扩展的量子信息处理和长时间非平衡量子多体物理的量子模拟提供了机会。

英文摘要

Ultracold molecular systems have recently emerged as a versatile platform for quantum computation and simulation. Spin-exchange interactions arising from direct molecular dipolar interactions constitute the key mechanism for generating quantum entanglement and simulating quantum spin models. However, the relatively small electric dipole moments result in weak spin-exchange couplings, fundamentally limiting the speed of quantum information processing and interaction cycle of many-body dynamics. Here, we introduce a framework that employs Rydberg atoms with large electric dipole moments to mediate strong interactions between molecules in optical tweezer arrays that enables individually laser addressing both the Rydberg atom and molecules. Our result reveals that the mediated coupling can realize an effective molecular spin-exchange interaction with an intrinsic Dzyaloshinskii-Moriya character, with the Rydberg atoms dynamically decoupled from the molecular degrees of freedom, and the effective interaction strength enhanced by up to three orders of magnitude. We further demonstrate its versatility through rapid entanglement generation, high-fidelity two-qubit gate operations, and the realization of non-equilibrium symmetry-protected topological phase with long-lived edge coherence. Our work establishes a route toward strong molecular spin interactions and opens opportunities for fast, scalable quantum information processing and quantum simulation of long-time non-equilibrium quantum many-body physics in optical tweezer arrays of ultracold molecules.

发表机构

• Shanxi University（山西大学）
• Imperial College London（伦敦帝国理工学院）
• The University of Nottingham（诺丁汉大学）

机构由 AI 辅助整理，请以论文原文为准。