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arXiv 2005.06082quant-phcond-mat.mes-hall
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固态自旋量子比特中的普适相干保护

Universal coherence protection in a solid-state spin qubit

Kevin C. Miao, Joseph P. Blanton, Christopher P. Anderson, Alexandre Bourassa, Alexander L. Crook, Gary Wolfowicz, Hiroshi Abe, Takeshi Ohshima, David D. Awschalom

摘要:

退相干在很大程度上限制了量子比特的物理实现,其缓解对量子科学至关重要。在这里,我们构建了一个强大的量子位嵌入在消相干保护的子空间,通过杂交应用微波驱动与碳化硅双空位缺陷的基态电子自旋。量子位被保护不受磁、电和温度波动的影响,这些波动几乎解释了固态中所有相关的退相干通道。这最终导致量子比特的非均匀退相时间增加了超过四个数量级(至> 22毫秒),而其哈恩回波相干时间接近64毫秒。由于只需要很少的关键平台独立组件,这一结果表明,在广泛的量子架构选择中可以实现实质性的相干性改进。

英文摘要:

Decoherence largely limits the physical realization of qubits and its mitigation is critical to quantum science. Here, we construct a robust qubit embedded in a decoherence-protected subspace, obtained by hybridizing an applied microwave drive with the ground-state electron spin of a silicon carbide divacancy defect. The qubit is protected from magnetic, electric, and temperature fluctuations, which account for nearly all relevant decoherence channels in the solid state. This culminates in an increase of the qubit's inhomogeneous dephasing time by over four orders of magnitude (to > 22 milliseconds), while its Hahn-echo coherence time approaches 64 milliseconds. Requiring few key platform-independent components, this result suggests that substantial coherence improvements can be achieved in a wide selection of quantum architectures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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