Type-1.5 SNSPD: Interacting vortex theory of two bandgap superconducting single photon detectors

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-09-25 DOI:10.1063/5.0289611

Leif Bauer, Daien He, Sathwik Bharadwaj, Shunshun Liu, Prasanna V. Balachandran, Zubin Jacob

引用次数: 0

Abstract

Photon detectors based on type-2 superconductors have found widespread applications from on-chip quantum computing to quantum remote sensing. Here, we develop the theory for a different class of type-1.5 superconducting nanowire single photon detectors (SNSPDs) based on two bandgap superconductors with high transition temperatures such as MgB2 (Tc∼ 38.6 K). We show that vortex–vortex interactions in two component condensates lead to a unique operating regime where single photons can seed multiple vortices within a hotspot. We also show that dark counts are suppressed in the type-1.5 regime compared to the widely studied type-2 SNSPDs. Our work opens the door for exploring the unique vortex physics of two-gap superconductors for quantum device applications.

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Type-1.5 SNSPD：两个带隙超导单光子探测器的相互作用涡旋理论

基于2型超导体的光子探测器已经从片上量子计算到量子遥感得到了广泛的应用。在这里，我们开发了一种不同类型的1.5型超导纳米线单光子探测器（SNSPDs）的理论，该探测器基于具有高转变温度的两种带隙超导体，如MgB2 （Tc ~ 38.6 K）。我们表明，涡旋-涡旋相互作用在双组分凝聚导致一个独特的操作制度，其中单个光子可以种子多个漩涡在一个热点。我们还表明，与广泛研究的2型snspd相比，1.5型snspd的暗计数受到抑制。我们的工作为探索量子器件应用中双间隙超导体独特的涡旋物理打开了大门。

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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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.