Spin chains have long been considered an effective medium for long-range interactions, entanglement generation, and quantum state transfer. In this work, we explore the properties of a spin chain implemented with superconducting flux circuits, designed to act as a connectivity medium between two superconducting qubits. The susceptibility of the chain is probed and shown to support long-range, cross-chain correlations. In addition, interactions between the two end qubits, mediated by the coupler chain, are demonstrated. This work has direct applicability in near term quantum annealing processors as a means of generating long-range, coherent coupling between qubits.

自旋链长期以来一直被认为是长程相互作用、纠缠产生和量子态转移的有效介质。在这项工作中，我们探索了用超导通量电路实现的自旋链的特性，该电路旨在充当两个超导量子位之间的连接介质。对链的敏感性进行了探索，并表明它支持长期的跨链相关性。此外，还展示了由耦合链介导的两个末端量子位之间的相互作用。这项工作直接适用于近期的量子退火处理器，作为在量子位之间产生远程、相干耦合的一种手段。