Cavity piezo-mechanics for superconducting-nanophotonic quantum interface
Cavity piezo-mechanics for superconducting-nanophotonic quantum interface
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DOI：
10.1038/s41467-020-17053-3
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发表时间：
2020-06-26
影响因子：
16.6
通讯作者：
Tang, Hong X.
中科院分区：
文献类型：
--
作者：
Han, Xu;Fu, Wei;Tang, Hong X.
混合量子系统是实现分布式量子网络的关键。特别是，在典型超导量子比特频率下工作的压电力学具有低热激发的特点，并为超导量子处理器和光通信通道提供了一个有吸引力的平台。然而，在低温条件下，将超导和光力学元件与足够强的相互作用相结合仍然是一个巨大的挑战。在这里，我们报道了一个集成的超导腔压电光机械平台，其中10 GHz声子同时在超导腔和纳米光子腔中与光子共振耦合。利用大的压电-机械协同性（C-em类似于7）和脉冲光泵增强的光-机械耦合，我们通过观察有效的微波-光光子转换，证明了低温下的相干相互作用。这种混合接口使大规模量子通信迈出了实质性的一步，并在微波光光子纠缠和由千兆赫声子介导的量子传感方面进行了新的探索。混合量子系统将允许将超导节点与光学链路连接起来。在这里，作者展示了一个集成平台，其中10ghz声子同时在超导腔和纳米光子腔中与光子共振耦合，从而实现了双向微波-光学转换的有效中介。
Hybrid quantum systems are essential for the realization of distributed quantum networks. In particular, piezo-mechanics operating at typical superconducting qubit frequencies features low thermal excitations, and offers an appealing platform to bridge superconducting quantum processors and optical telecommunication channels. However, integrating superconducting and optomechanical elements at cryogenic temperatures with sufficiently strong interactions remains a tremendous challenge. Here, we report an integrated superconducting cavity piezo-optomechanical platform where 10 GHz phonons are resonantly coupled with photons in a superconducting cavity and a nanophotonic cavity at the same time. Taking advantage of the large piezo-mechanical cooperativity (C-em similar to 7) and the enhanced optomechanical coupling boosted by a pulsed optical pump, we demonstrate coherent interactions at cryogenic temperatures via the observation of efficient microwave-optical photon conversion. This hybrid interface makes a substantial step towards quantum communication at large scale, as well as novel explorations in microwave-optical photon entanglement and quantum sensing mediated by gigahertz phonons. Hybrid quantum systems would allow interfacing superconducting nodes with optical links. Here, the authors demonstrate an integrated platform where 10 GHz phonons are resonantly coupled with photons in a superconducting cavity and a nanophotonic cavity at the same time, allowing efficient mediation of bidirectional microwave-optical conversion.