Low-Loss Superconducting Nanowire Circuits Using a Neon Focused Ion Beam
Low-Loss Superconducting Nanowire Circuits Using a Neon Focused Ion Beam
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DOI：
10.1103/physrevapplied.8.014039
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发表时间：
2017-07-31
影响因子：
4.6
通讯作者：
Fenton, J. C.
中科院分区：
文献类型：
--
作者：
Burnett, J.;Sagar, J.;Fenton, J. C.
我们提出了低温测量低损耗的超导嵌入式谐振器在量子电路相关的低功率限制。超导谐振器嵌入超导纳米线的宽度下降到20 nm，使用氖聚焦离子束。在低功耗极限下，我们证明了在300 mK时内部品质因数高达3.9 x 10（5）[意味着在10 mK时两级系统限制品质因数高达2 x 10（5）]，不仅显著高于类似器件，而且与传统约瑟夫森结嵌入式谐振器的最新技术水平相匹配。我们还显示了高灵敏度的纳米线的杂散红外光子，这是可控的适当的预防措施，以尽量减少杂散光子在样品环境中。我们的研究结果表明，基于超导纳米线的量子电路具有良好的前景。
We present low-temperature measurements of low-loss superconducting nanowire-embedded resonators in the low-power limit relevant for quantum circuits. The superconducting resonators are embedded with superconducting nanowires with widths down to 20 nm using a neon focused ion beam. In the low-power limit, we demonstrate an internal quality factor up to 3.9 x 10(5) at 300 mK [implying a two-level-systemlimited quality factor up to 2 x 10(5) at 10 mK], not only significantly higher than in similar devices but also matching the state of the art of conventional Josephson-junction-embedded resonators. We also show a high sensitivity of the nanowire to stray infrared photons, which is controllable by suitable precautions to minimize stray photons in the sample environment. Our results suggest that there are excellent prospects for superconducting-nanowire-based quantum circuits.