Direct interactions between quantum particles naturally fall off with distance. However, future quantum computing architectures are likely to require interaction mechanisms between qubits across a range of length scales. In this work, we demonstrate a coherent interaction between two semiconductor spin qubits 250 μm apart using a superconducting resonator. This separation is several orders of magnitude larger than for the commonly used direct interaction mechanisms in this platform. We operate the system in a regime in which the resonator mediates a spin–spin coupling through virtual photons. We report the anti-phase oscillations of the populations of the two spins with controllable frequency. The observations are consistent with iSWAP oscillations of the spin qubits, and suggest that entangling operations are possible in 10 ns. These results hold promise for scalable networks of spin qubit modules on a chip.

量子粒子之间的直接相互作用会随着距离的增加而自然消失。然而，未来的量子计算架构可能需要跨一系列长度尺度的量子比特之间的交互机制。在这项工作中，我们使用超导谐振器展示了两个相距 250 μm 的半导体自旋量子比特之间的相干相互作用。这种分离比该平台中常用的直接交互机制大几个数量级。我们在谐振器通过虚拟光子介导自旋-自旋耦合的制度下运行该系统。我们以可控的频率报告了两个自旋种群的反相振荡。这些观察结果与自旋量子比特的 iSWAP 振荡一致，并表明在 10 ns 内可以进行纠缠操作。这些结果为芯片上的自旋量子比特模块的可扩展网络带来了希望。