在现场扫描门成像在现场超导电路中的单个量子双层系统缺陷
Marius Hegedüs1,2, Riju Banerjee1, Andrew Hutcheson1
1National Physical Laboratory, Teddington TW11 0LW, UK.
Science advances
|April 30, 2025
概括
研究人员使用扫描门显微镜在无形材料中发现了个别的两级系统 (TLS) 缺陷. 这揭示了TLS的微观性质,这对于理解和减轻量子计算中的不连贯性至关重要.
科学领域:
- 低温物理 低温物理
- 凝聚物质物理学 凝聚物质物理学
- 量子计算是一种量子计算.
背景情况:
- 无形材料表现出控制低温物理的低能两级系统 (TLS) 缺陷.
- 由于传统探测器的局限性,TLS的确切起源和性质尚不清楚.
- 在固态量子电路中,TLS是脱凝和不稳定的主要来源.
研究的目的:
- 直接定位和揭示个别TLS缺陷的微观性质.
- 确定1/f介电噪声和能量放松的主要来源.
- 为了推断TLS电偶极时刻的方向.
主要方法:
- 扫描门显微镜在超导NbN共振器上进行.
- 在米基尔文温度下进行的实验.
- 个别TLS缺陷的直接可视化和映射.
主要成果:
- 成功地发现了个别的TLS缺陷,揭示了它们的微观性质.
- 确定了特定的TLS作为对介电噪声和能量放松的主要贡献者.
- 确定了单个TLS电偶极电流的三维方向.
结论:
- 扫描门显微镜可以直接了解无形材料中TLS的性质.
- 了解TLS对于提高量子计算平台的连贯性至关重要.
- 这项工作为有针对性的策略铺平了道路,以减轻TLS引起的脱节.
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