用超导量子比特测量柔性微波带状线的热化

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-01-23 DOI:10.1063/5.0243116

Patrick Paluch, Martin Spiecker, Nicolas Gosling, Viktor Adam, Jakob Kammhuber, Kiefer Vermeulen, Daniël Bouman, Wolfgang Wernsdorfer, Ioan M. Pop

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引用次数: 0

摘要

随着对可扩展低温微波电路的需求不断增加，最近开发的柔性微波带状线提供了诱人的前景，可以在不使低温恒温器热过载的情况下将布线密度提高一个数量级。我们使用超导量子电路测试了输入软电缆在不同温度阶段的热化，并集成了60db的衰减分布。根据测量到的超导量子比特的退相干率，我们估计读出谐振腔的剩余居数为（2.2±0.9）×10−3个光子，我们测量了柔性带状线衰减器的0.28 ms热化时间。此外，我们确认量子比特达到了26.4 mK的有效温度，接近低温恒温器的基础温度，几乎与使用传统的半刚性同轴电缆设置时相同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Thermalization of a flexible microwave stripline measured by a superconducting qubit

With the demand for scalable cryogenic microwave circuitry continuously rising, recently developed flexible microwave striplines offer the tantalizing perspective of increasing the cabling density by an order of magnitude without thermally overloading the cryostat. We use a superconducting quantum circuit to test the thermalization of input flex cables with integrated 60 dB of attenuation distributed at various temperature stages. From the measured decoherence rate of a superconducting fluxonium qubit, we estimate a residual population of the readout resonator of (2.2±0.9)×10−3 photons and we measure a 0.28 ms thermalization time for the flexible stripline attenuators. Furthermore, we confirm that the qubit reaches an effective temperature of 26.4 mK, close to the base temperature of the cryostat, practically the same as when using a conventional semi-rigid coaxial cable setup.

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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.