量子位元
磁通量子比特
超导量子计算
物理
超电流
相位量子位
凝聚态物理
约瑟夫森效应
联轴节(管道)
电荷量子位
自旋(空气动力学)
旋转
量子力学
量子计算机
超导电性
量子
材料科学
冶金
热力学
作者
Marta Pita-Vidal,Jaap J. Wesdorp,Lukas Johannes Splitthoff,Arno Bargerbos,Yu Liu,Leo P. Kouwenhoven,Christian Kraglund Andersen
出处
期刊:Cornell University - arXiv
日期:2023-01-01
被引量:1
标识
DOI:10.48550/arxiv.2307.15654
摘要
Superconducting (or Andreev) spin qubits have recently emerged as an alternative qubit platform with realizations in semiconductor-superconductor hybrid nanowires. In these qubits, the spin degree of freedom is intrinsically coupled to the supercurrent across a Josephson junction via the spin-orbit interaction, which facilitates fast, high-fidelity spin readout using circuit quantum electrodynamics techniques. Moreover, this spin-supercurrent coupling has been predicted to facilitate inductive multi-qubit coupling. In this work, we demonstrate a strong supercurrent-mediated coupling between two distant Andreev spin qubits. This qubit-qubit interaction is of the longitudinal type and we show that it is both gate- and flux-tunable up to a coupling strength of 178 MHz. Finally, we find that the coupling can be switched off in-situ using a magnetic flux. Our results demonstrate that integrating microscopic spin states into a superconducting qubit architecture can combine the advantages of both semiconductors and superconducting circuits and pave the way to fast two-qubit gates between remote spins.
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