用氖聚焦离子束制造的毫开尔文铌纳米鱿鱼嵌入可调谐谐振器

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-01-03 DOI:10.1063/5.0230505

Jamie A. Potter, Laith Meti, Gemma Chapman, Ed Romans, John Gallop, Ling Hao

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引用次数: 0

摘要

squid嵌入式超导谐振器由于具有将高可扩展超导电路与基于固态自旋综的量子存储器耦合的潜力而引起了人们的极大兴趣。这样的应用需要一个高q、频率可调的谐振器，它既能适应磁场，又能在毫开尔文的温度下工作。这些要求促使使用更高Hc的金属，如铌；然而，接下来的挑战就变成了如何充分降低操作温度。为了解决这个问题，我们提出了一个单片Nb纳米squid嵌入式谐振器，其中纳米squid的氖聚焦离子束制造导致器件在T=16 mK时显示频率可调性。为了评估该器件耦合小自旋簇的适用性，我们将磁通灵敏度表征为微波驱动功率和外部外加磁场的函数，并发现谐振器中的噪声主要是介电噪声。最后，我们讨论了器件设计的改进，可以显着提高通量灵敏度，这突出了Nb squid嵌入式谐振器在混合超导体自旋应用中的前景。

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Millikelvin Nb nanoSQUID-embedded tunable resonator fabricated with a neon focused-ion-beam

SQUID-embedded superconducting resonators are of great interest due to their potential for coupling highly scalable superconducting circuits with quantum memories based on solid-state spin ensembles. Such an application requires a high-Q, frequency-tunable resonator that is both resilient to magnetic field and able to operate at millikelvin temperatures. These requirements motivate the use of a higher Hc metal such as niobium; however, the challenge then becomes to sufficiently reduce the operating temperature. We address this by presenting a monolithic Nb nanoSQUID-embedded resonator, where neon focused-ion-beam fabrication of the nanoSQUID results in a device displaying frequency tunability at T=16 mK. In order to assess the applicability of the device for coupling to small spin clusters, we characterize the flux sensitivity as a function of microwave drive power and externally applied magnetic field and find that the noise is dominated by dielectric noise in the resonator. Finally, we discuss improvements to the device design that can dramatically improve the flux sensitivity, which highlights the promise of Nb SQUID-embedded resonators for hybrid superconductor-spin applications.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.