Fabrication and nanophotonic waveguide integration of silicon carbide colour centres with preserved spin-optical coherence
Fabrication and nanophotonic waveguide integration of silicon carbide colour centres with preserved spin-optical coherence
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DOI：
10.1038/s41563-021-01148-3
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发表时间：
2021-11-18
期刊：
影响因子：
41.2
通讯作者：
Wrachtrup, Joerg
中科院分区：
文献类型：
--
作者：
Babin, Charles;Stoehr, Rainer;Wrachtrup, Joerg
色心是一个很有前途的量子信息平台，但在纳米结构中集成后的相干性退化阻碍了可扩展性。在这里，作者表明，波导集成的V-Si中心SiC保持自旋光学相干性，使核高保真自旋qubit operations.Optically可寻址的碳化硅（SiC）中的自旋缺陷是一个新兴的平台，量子信息处理兼容的纳米加工工艺和半导体行业使用的设备控制。系统向大规模量子网络的可扩展性要求集成到具有高效自旋光子接口的纳米光子结构中。然而，在纳米光子结构中集成后自旋光学相干性的退化阻碍了大多数色心平台的潜力。在这里，我们证明了硅空位中心（V-Si）在SiC中的注入，而不恶化其固有的自旋光学性能。特别是，我们显示了近寿命有限的光子发射和高自旋相干时间的单个缺陷植入体以及在纳米光子波导反应离子蚀刻创建。此外，我们利用波导中V-Si中心的高自旋光学相干性来演示对附近核自旋量子比特的受控操作，这是基于腔量子电动力学的容错量子信息分配的关键一步。
Colour centres are a promising quantum information platform, but coherence degradation after integration in nanostructures has hindered scalability. Here, the authors show that waveguide-integrated V-Si centres in SiC maintain spin-optical coherences, enabling nuclear high-fidelity spin qubit operations.Optically addressable spin defects in silicon carbide (SiC) are an emerging platform for quantum information processing compatible with nanofabrication processes and device control used by the semiconductor industry. System scalability towards large-scale quantum networks demands integration into nanophotonic structures with efficient spin-photon interfaces. However, degradation of the spin-optical coherence after integration in nanophotonic structures has hindered the potential of most colour centre platforms. Here, we demonstrate the implantation of silicon vacancy centres (V-Si) in SiC without deterioration of their intrinsic spin-optical properties. In particular, we show nearly lifetime-limited photon emission and high spin-coherence times for single defects implanted in bulk as well as in nanophotonic waveguides created by reactive ion etching. Furthermore, we take advantage of the high spin-optical coherences of V-Si centres in waveguides to demonstrate controlled operations on nearby nuclear spin qubits, which is a crucial step towards fault-tolerant quantum information distribution based on cavity quantum electrodynamics.