Coherent coupling between a ferromagnetic magnon and a superconducting qubit
Coherent coupling between a ferromagnetic magnon and a superconducting qubit
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DOI：
10.1126/science.aaa3693
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发表时间：
2015-07-24
期刊：
影响因子：
56.9
通讯作者：
Nakamura, Yasunobu
中科院分区：
文献类型：
--
作者：
Tabuchi, Yutaka;Ishino, Seiichiro;Nakamura, Yasunobu
凝聚态中有序相的刚性导致集体激发模式在空间上延伸到宏观维度。磁振子是有序自旋系统中这种集体激发模式的量子。在这里，我们展示了在毫米大小的铁磁球中单磁振子激发与超导量子比特之间的相干耦合，其中相互作用由微波腔中的虚光子激发介导。我们得到了耦合强度远远超过阻尼率，从而使混合动力系统进入强耦合状态。此外，我们使用参数驱动来实现可调谐的磁non-qubit耦合方案。我们的方法为磁振子激发的量子控制和测量提供了一个通用的工具，并可能导致量子信息处理的进步。
Rigidity of an ordered phase in condensed matter results in collective excitation modes spatially extending to macroscopic dimensions. A magnon is a quantum of such collective excitation modes in ordered spin systems. Here, we demonstrate the coherent coupling between a single-magnon excitation in a millimeter-sized ferromagnetic sphere and a superconducting qubit, with the interaction mediated by the virtual photon excitation in a microwave cavity. We obtain the coupling strength far exceeding the damping rates, thus bringing the hybrid system into the strong coupling regime. Furthermore, we use a parametric drive to realize a tunable magnon-qubit coupling scheme. Our approach provides a versatile tool for quantum control and measurement of the magnon excitations and may lead to advances in quantum information processing.