Non-volatile programmable components for the superconducting computer

用于超导计算机的非易失性可编程组件

• 批准号: EP/V028138/1
• 负责人: Gavin Burnell
• 金额: $ 65.43万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FV028138%2F1
• 关键词: Non; volatile; programmable; components; superconducting

The dissipation of heat in traditional silicon (CMOS) based electronics is a major source of inefficiency and environmental impact. Superconductors are, by nature, dissipationless. Building a new digital computational scheme based on superconductors offers huge potential gains in energy efficiency, which could be applied to large scale needs such as supercomputers and data centres to lower the overall carbon footprint of the ICT ecosystem. Digital superconducting computers also have important niche applications such as in the control and read-out of qubits. The fundamental building block of the superconducting computer is the Josephson junction, which is proposed as a replacement for the CMOS transistor. Computing via logic circuits based on Josephson junctions is not only more energy efficient, but also faster than CMOS technologies. The largest remaining problem is the lagging development of low-temperature memory. Traditional magnetic and CMOS memories are not well suited for low-temperature operation. To achieve the promised efficiency increases of these computers requires a new type of low-temperature memory architecture. Our proposal here aims to combine superconducting circuits with magnetic memory elements, such as spin-valves, where the information is encoded into the magnetic state of the device but writing and read-out is achieved by the superconducting elements of the circuit for maximum energy efficiency and compatibility with the rest of the computer. Traditionally considered competing phenomena, when artificially juxtaposed a wealth of new physics at the interface between superconductors and ferromagnets emerges. It is possible to use these proximity effects to create new, highly energy efficient devices in two ways. The first exploits the natural competition between the phenomena, where information is stored by a "zero - pi" ground-state phase difference across a Josephson junction containing a ferromagnetic barrier. The second exploits a unique synergy, found in the form of the (equal spin) triplet Cooper pair. This new triplet Cooper pair is not broken by the exchange field of a ferromagnet, providing a dissipationless source of spin polarized current for use in novel spintronic devices. We plan to fully exploit these new physics in our research programme to open the potential novelty of our devices. The UK risks being left behind in the field of superconducting computing by large US research efforts such as the IARPA C3 programme. This programme will take advantage of our existing expertise and collaboration with leading US groups to develop the promising application of cryogenic memory.

传统的基于硅（CMOS）的电子器件中的热耗散是效率低下和环境影响的主要来源。超导体本质上是无耗散的。建立一个基于超导体的新的数字计算方案可以在能源效率方面获得巨大的潜在收益，这可以应用于超级计算机和数据中心等大规模需求，以降低ICT生态系统的整体碳足迹。数字超导计算机也有重要的利基应用，如量子位的控制和读出。超导计算机的基本构件是约瑟夫森结，它被提议作为CMOS晶体管的替代品。通过基于约瑟夫森结的逻辑电路进行计算不仅更节能，而且比CMOS技术更快。最大的遗留问题是低温存储器的发展滞后。传统的磁性和CMOS存储器不太适合低温操作。为了实现这些计算机所承诺的效率提高，需要一种新型的低温存储器架构。我们在这里的建议旨在将联合收割机超导电路与磁存储元件（如自旋阀）结合起来，其中信息被编码到设备的磁状态中，但写入和读出由电路的超导元件实现，以实现最大的能量效率和与计算机其余部分的兼容性。传统上被认为是竞争现象，当人工并列的超导体和铁磁体之间的界面出现了丰富的新物理。可以通过两种方式使用这些邻近效应来创建新的高能效设备。第一个利用现象之间的自然竞争，其中信息存储的“零π”的基态相位差跨越约瑟夫森结包含铁磁屏障。第二个利用了一种独特的协同作用，以（等自旋）三重态库珀对的形式存在。这种新的三重态库珀对不被铁磁体的交换场破坏，提供了用于新型自旋电子器件的自旋极化电流的无耗散源。我们计划在我们的研究计划中充分利用这些新物理学，以打开我们设备的潜在新奇。英国在超导计算领域有可能被美国的大型研究项目（如IARPA C3项目）甩在后面。该计划将利用我们现有的专业知识和与美国领先集团的合作，开发低温存储器的应用前景。

项目成果

Absence of magnetic interactions in Ni-Nb ferromagnet-superconductor bilayers

Ni-Nb 铁磁体-超导体双层中不存在磁相互作用

• DOI: 10.1088/1361-6668/acc430
• 发表时间: 2023
• 期刊: Superconductor Science and Technology
• 影响因子: 3.6
• 作者: Satchell N

Thin film epitaxial [111] Co$_{50}$Pt$_{50}$: Structure, magnetisation, and spin polarisation

薄膜外延 [111] Co$_{50}$Pt$_{50}$：结构、磁化强度和自旋极化

• DOI: 10.48550/arxiv.2212.04370
• 发表时间: 2022
• 作者: Satchell N

Meissner screening as a probe for inverse superconductor-ferromagnet proximity effects

迈斯纳筛选作为反超导-铁磁体邻近效应的探针

• DOI: 10.1103/physrevb.104.l060506
• 发表时间: 2021
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Flokstra M

Thin film epitaxial [111] Co[Formula: see text]Pt[Formula: see text]: structure, magnetisation, and spin polarisation.

• DOI: 10.1038/s41598-023-37825-3
• 发表时间: 2023-08-01
• 期刊: SCIENTIFIC REPORTS
• 影响因子: 4.6
• 作者: Satchell, N.;Gupta, S.;Maheshwari, M.;Shepley, P. M.;Rogers, M.;Cespedes, O.;Burnell, G.
• 通讯作者: Burnell, G.

Spin-orbit driven superconducting proximity effects in Pt/Nb thin films.

• DOI: 10.1038/s41467-023-40757-1
• 发表时间: 2023-08-21
• 期刊: NATURE COMMUNICATIONS
• 影响因子: 16.6
• 作者: Flokstra, Machiel;Stewart, Rhea;Yim, Chi-Ming;Trainer, Christopher;Wahl, Peter;Miller, David;Satchell, Nathan;Burnell, Gavin;Luetkens, Hubertus;Prokscha, Thomas;Suter, Andreas;Morenzoni, Elvezio;Bobkova, Irina V.;Bobkov, Alexander M.;Lee, Stephen
• 通讯作者: Lee, Stephen