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

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arxiv 2111.04284 v2 pith:TPXDLURO submitted 2021-11-08 quant-ph

Daniel M. Tennant , Xi Dai , Antonio J. Martinez , Robbyn Trappen , Denis Melanson , M A. Yurtalan , Yongchao Tang , Salil Bedkihal
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Rui Yang Sergei Novikov Jeffery A. Grover Steven M. Disseler James I. Basham Rabindra Das David K. Kim Alexander J. Melville Bethany M. Niedzielski Steven J. Weber Jonilyn L. Yoder Andrew J. Kerman Evgeny Mozgunov Daniel A. Lidar Adrian Lupascu
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keywords chainlong-rangequbitsspinsuperconductingcorrelationsinteractionsmedium
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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.

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