EAGER: BRAIDING: Collaborative Research: Manipulation of Majorana Modes in Topological Crystalline Insulator Nanowires

EAGER：编织：合作研究：拓扑晶体绝缘体纳米线中马约拉纳模式的操纵

• 批准号: 1743913
• 负责人: James Williams
• 金额: $ 15万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1743913&HistoricalAwards=false
• 关键词: EAGER; BRAIDING; Collaborative; Research; Manipulation

Non-technical Abstract:The team aims to make topological superconducting nanowires as the building blocks of new quantum computers that are more robust and energy efficient than current quantum computers. Nanodevices based on these nanowires are used to demonstrate the basic rules for quantum computations. The superconducting nanowires are made of indium doped tin telluride, and are expected to alleviate some of the challenging technical constraints imposed on a competing system, a semiconducting nanowire with large spin orbit coupling. A portion of the research is included in the undergraduate and graduate physics curriculum to inspire and encourage students to pursue research. Undergraduate students are involved in the project through senior research projects, REU programs, and summer research internships. Collaboration between Yale University and the University of Maryland at College Park provide broader networking opportunities to graduate students. Technical Abstract:The team aims to demonstrate braiding anyon world lines using indium-doped tin telluride (SnTe) topological superconductor nanowires and nanowire junctions. Indium-doped SnTe - SnTe junction nanowires are synthesized via a growth method that adapts the vapor-liquid-solid growth mechanism. Superconducting topological nanowires eliminate the need for superconducting contacts. Nanodevices using the heterojunction nanowires are be fabricated to demonstrate the signatures of Majorana fermions (MFs) at the junctions and perform fusion and braiding operations. A half quantum flux magnetic field is to be applied parallel to the nanowire to ensure the topological superconducting phase while small additional local magnetic fields are to be used to generate, manipulate, and fuse MFs. Quantum dot devices on the nanowire are used to read out the parity through the parity-to-charge conversion. The use of magnetic fields, instead of electric gating, combined with relaxed conditions for the placement of chemical potentials, represents technical advantages for this system.

非技术摘要：该团队的目标是使拓扑超导纳米线作为新量子计算机的构建模块，比当前的量子计算机更强大，更节能。 基于这些纳米线的纳米器件用于演示量子计算的基本规则。 超导纳米线由铟掺杂的碲化锡制成，预计将减轻对竞争系统施加的一些具有挑战性的技术限制，这是一种具有大自旋轨道耦合的半导体纳米线。 研究的一部分被纳入本科和研究生物理课程，以激励和鼓励学生进行研究。 本科生通过高级研究项目，REU计划和夏季研究实习参与该项目。 耶鲁大学和马里兰州大学帕克分校之间的合作为研究生提供了更广泛的交流机会。 技术摘要：该团队的目标是展示使用铟掺杂碲化锡（SnTe）拓扑超导体纳米线和纳米线结编织任意子世界线。 采用气-液-固生长机制合成了铟掺杂的SnTe-SnTe结纳米线。 超导拓扑纳米线消除了对超导接触的需要。 使用异质结纳米线的纳米器件被制造，以证明在结处的马约拉纳费米子（MF）的签名，并执行融合和编织操作。 平行于纳米线施加半量子通量磁场以确保拓扑超导相，同时使用小的附加局部磁场来产生、操纵和熔合MF。 纳米线上的量子点器件用于通过宇称-电荷转换读出宇称。 使用磁场而不是电动门控，结合用于放置化学势的宽松条件，代表了该系统的技术优势。