Simulation and Measurement of Stray Fields for the Manipulation of Spin Qubits in One- and Two-Dimensional Arrays

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-01-22 DOI:10.1021/acs.nanolett.4c0503710.1021/acs.nanolett.4c05037

Michele Aldeghi, Rolf Allenspach, Andriani Vervelaki, Daniel Jetter, Kousik Bagani, Floris Braakman, Martino Poggio and Gian Salis*,

{"title":"Simulation and Measurement of Stray Fields for the Manipulation of Spin Qubits in One- and Two-Dimensional Arrays","authors":"Michele Aldeghi, Rolf Allenspach, Andriani Vervelaki, Daniel Jetter, Kousik Bagani, Floris Braakman, Martino Poggio and Gian Salis*, ","doi":"10.1021/acs.nanolett.4c0503710.1021/acs.nanolett.4c05037","DOIUrl":null,"url":null,"abstract":"<p >The inhomogeneous magnetic stray field of micromagnets has been extensively used to manipulate electron spin qubits. By means of micromagnetic simulations and scanning superconducting quantum interference device microscopy, we show that the polycrystallinity of the magnet and nonuniform magnetization significantly impact the stray field and corresponding qubit properties. The random orientation of the crystal axis in polycrystalline Co magnets alters the qubit frequencies by up to 0.5 GHz, compromising single qubit addressability and single gate fidelities. We map the stray field of Fe micromagnets with an applied magnetic field of up to 500 mT, finding field gradients above 1 mT/nm. The measured gradients and the lower magnetocrystalline anisotropy of Fe demonstrate the advantage of using Fe instead of Co as magnets in spin qubit devices. These properties of Fe also enabled us to design a 2D arrangement of nanomagnets for driving spin qubits distributed on a 2D lattice.</p>","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"25 5","pages":"1838–1844 1838–1844"},"PeriodicalIF":9.1000,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acs.nanolett.4c05037","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nano Letters","FirstCategoryId":"88","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.nanolett.4c05037","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

The inhomogeneous magnetic stray field of micromagnets has been extensively used to manipulate electron spin qubits. By means of micromagnetic simulations and scanning superconducting quantum interference device microscopy, we show that the polycrystallinity of the magnet and nonuniform magnetization significantly impact the stray field and corresponding qubit properties. The random orientation of the crystal axis in polycrystalline Co magnets alters the qubit frequencies by up to 0.5 GHz, compromising single qubit addressability and single gate fidelities. We map the stray field of Fe micromagnets with an applied magnetic field of up to 500 mT, finding field gradients above 1 mT/nm. The measured gradients and the lower magnetocrystalline anisotropy of Fe demonstrate the advantage of using Fe instead of Co as magnets in spin qubit devices. These properties of Fe also enabled us to design a 2D arrangement of nanomagnets for driving spin qubits distributed on a 2D lattice.

查看原文本刊更多论文

一维和二维阵列中自旋量子比特操纵的杂散场模拟与测量

微磁体的非均匀杂散磁场已被广泛用于操纵电子自旋量子比特。通过微磁模拟和扫描超导量子干涉装置显微镜，我们发现磁体的多晶性和不均匀磁化显著影响杂散场和相应的量子比特性质。多晶钴磁体中晶体轴的随机方向可改变量子比特频率达0.5 GHz，从而影响单量子比特的可寻址性和单门保真度。我们绘制了外加磁场高达500 mT的Fe微磁体的杂散场，发现磁场梯度大于1 mT/nm。测量的梯度和铁较低的磁晶各向异性表明了在自旋量子比特器件中使用铁代替钴作为磁体的优势。铁的这些特性也使我们能够设计一种二维纳米磁体排列，用于驱动分布在二维晶格上的自旋量子比特。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.