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.

摘要：该团队的目标是将拓扑超导纳米线作为新型量子计算机的基石，这种新型量子计算机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被用来演示量子计算的基本规则。超导纳米线由铟掺杂碲化锡制成，有望缓解竞争系统（具有大自旋轨道耦合的半导体纳米线）所面临的一些具有挑战性的技术限制。研究的一部分被包括在本科和研究生物理课程中，以激励和鼓励学生进行研究。本科生通过高级研究项目、REU项目和暑期研究实习参与该项目。耶鲁大学和马里兰大学帕克分校的合作为研究生提供了更广泛的交流机会。技术摘要：该团队旨在展示使用掺杂铟碲化锡（SnTe）拓扑超导纳米线和纳米线结编织任意粒子世界线。采用适应气-液-固生长机制的生长方法合成了掺杂铟的SnTe - SnTe结纳米线。超导拓扑纳米线消除了超导接触的需要。利用异质结纳米线制备纳米器件，在异质结处展示马约拉纳费米子（MFs）的特征，并进行融合和编织操作。在纳米线上平行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MFs。利用纳米线上的量子点器件通过奇偶-电荷转换读出奇偶。使用磁场，而不是电门控，结合化学势放置的宽松条件，代表了该系统的技术优势。