Demonstration of long-range correlations via susceptibility measurements in a one-dimensional superconducting Josephson spin chain

作者：Daniel Tennant, Xi Dai, A. J. Martinez, Robbyn Trappen, Denis Melanson, Muhammet Ali Yurtalan, Yongchao Tang, Salil Bedkihal, Rui Yang, S P Novikov, Jeffrey A. Grover, Steven Disseler, James I. Basham, Rabindra Das, David Kim, A. J. Melville, Bethany M. Niedzielski, S. J. Weber, J. L. Yoder, Andrew J. Kerman, E. Mozgunov, Daniel A. Lidar, Adrian Lupaşcu · 发表于：npj Quantum Information · 年份：2022 · DOI：10.1038/s41534-022-00590-8 · 被引用次数：7 · 研究领域：Quantum and electron transport phenomena、Quantum Computing Algorithms and Architecture、Quantum many-body systems

Abstract 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.