EAGER: BRAIDING: Materials to enable voltage-gateable Majorana systems in silicon using top-down fabrication techniques

渴望：编织：使用自上而下的制造技术在硅中实现电压门控马约拉纳系统的材料

基本信息

批准号：
1743986
负责人：
Alex Levchenko
金额：
$ 30万
依托单位：
University of Wisconsin-Madison
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 2020-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1743986&HistoricalAwards=false
关键词：
EAGER BRAIDING Materials enable voltage

项目摘要

Non-technical Abstract: Modern state of the art single-chip processors that go into our everyday electronic devices, such as cellphones, contain billions of transistors. This number has been doubling ever since 1971 approximately every two years following the trend of Moore's law. Weare now at the threshold of ultimate capacity, which motivates the search for new integrated circuits. This EAGER project is for novel exploratory work whose eventual goal is to create and manipulate silicon-based superconducting heterostructures in order to provide a foundation for topological quantum transistors. This project builds on recent experimental progress demonstrating that superconductivity arises in doped covalent semiconductors, and the use of Si is attractive because this material is the most common semiconductor in the modern microelectronics industry. It is therefore motivating to explore an approach where highly scalable gate control of semiconductors can be incorporated into superconducting devices for quantum computing purposes. This could be achieved by defining superconducting-semiconductor quantum circuits using metal top gates, a technology similar to that currently employed in large scale microelectronics. Under certain conditions these circuits have very special properties encoded by Majorana modes, which are excitations that enable operations that are protected by topological principles. Thus, these systems are potentially highly resistant to various sources ofdecoherence, which is the main problem in non-topological quantum processors. Implementing topological quantum computation is a grand challenge with potentially transformative societal implications. The work on the project will have an impact on development of human resources by training of graduate students and other junior scientists in quantum information, nanofabrication, characterization of qubits and materials, theoretical simulation and calculation, and experimental design and practice.Technical Abstract: This EAGER project is for novel work to explore an approach where highly scalable gate control of semiconductors can be incorporated into superconducting devices for quantum computing purposes. The proposed research aims to characterize and develop superconducting semiconductor quantum circuits supporting Majorana fermion states using metal top gates, a technology similar to that currently employed in large-scale microelectronics. The project is balanced between the experiment and theory in the Physics Department of the University of Wisconsin-Madison. Experimental goals include: (i) development of lithographically patternable and voltage-gateable superconducting layers in silicon enriched by gallium; (ii) realization of all-silicon superconducting semiconductor Josephson field effect transistors; (iii) measurements of various transport characteristics of Josephson junctions such as current voltage characteristics, current-phase relationships, and Fraunhofer interference patterns. Theoretical efforts include exploration of patternable micromagnet configurations within the superconducting silicon channel that enable formation of robust Majorana modes. Theory work additionally includes computation of essential parameters for the silicon-gallium superconductor in the presence of doping-induced inhomogeneities, modeling transport characteristics of proposed devices, and determination of the phase diagram that hosts topologically nontrivial states in terms of realistic parameters that are controllable experimentally.

非技术摘要：进入我们日常电子设备（例如手机）的现代最先进的单芯片处理器，包含数十亿个晶体管。自1971年以来，这一数字就在摩尔定律趋势后每两年翻了一番。现在以最终容量的门槛磨损，这激发了寻找新的集成电路的搜索。这个急切的项目是针对新颖的探索性工作的，其最终目标是创建和操纵基于硅的超导异质结构，以为拓扑量子晶体管提供基础。该项目以最新的实验进度为基础，表明超导性是在掺杂的共价半导体中产生的，并且使用SI具有吸引力，因为该材料是现代微电子行业中最常见的半导体。因此，探索一种方法可以将半导体的高度可扩展门控制纳入超导设备以进行量子计算目的。这可以通过使用金属上门来定义超导型量子量子电路来实现，这是一种类似于当前在大规模微电子中使用的技术。在某些条件下，这些电路具有由Majoraana模式编码的非常特殊的特性，这些兴奋是使能够受拓扑原理保护的操作的激发。因此，这些系统潜在地对各种特定来源具有高度抗性，这是非量子量子处理器的主要问题。实施拓扑量子计算是一个巨大的挑战，具有潜在的变革性社会意义。该项目的工作将通过培训研究生和其他初级科学家的量子信息，纳米法规，量子和材料的表征，理论模拟和计算以及实验设计和实践的培训来影响人力资源的发展。这项急切的项目是用于探索高度可扩展的量子控制量的新型工作，可以探索该方法的量子。拟议的研究旨在使用金属顶门来表征和开发支持Majorana fermion态的超导半导体量子电路，这是一种类似于当前在大型微型微型中使用的技术。在威斯康星大学麦迪逊分校的物理系实验和理论之间，该项目是平衡的。实验目标包括：（i）在富含凝胶的硅中开发图案和可驱动电压的超导层；（ii）实现全硅质超导的半导体约瑟夫森场效应晶体管；（iii）测量约瑟夫森连接的各种运输特征，例如当前电压特性，电流相关关系和弗劳恩霍夫干扰模式。理论上的工作包括探索超导硅通道内的可模式的微型构型，从而可以形成健壮的Majorana模式。理论工作还包括在存在掺杂诱导的不均匀性的情况下计算硅 - 高级超导体的基本参数，对所提出的设备的转运特性进行建模，并确定相位图，该相图在可控的实验实验中托管拓扑上的非拓扑状态。

项目成果

期刊论文数量（6）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Majorana bound states in nanowire-superconductor hybrid systems in periodic magnetic fields

DOI：
10.1103/physrevb.101.125414
发表时间：
2019-11
期刊：
Physical Review B
影响因子：
3.7
作者：
V. Kornich;M. Vavilov;M. Friesen;M. Eriksson;S. Coppersmith
通讯作者：
V. Kornich;M. Vavilov;M. Friesen;M. Eriksson;S. Coppersmith

Josephson currents in chaotic quantum dots

混沌量子点中的约瑟夫森电流

DOI：
10.1103/physrevb.97.224515
发表时间：
2018
期刊：
Physical Review B
影响因子：
3.7
作者：
Whisler, Colin M.;Vavilov, Maxim G.;Levchenko, Alex
通讯作者：
Levchenko, Alex

The effect of external electric fields on silicon with superconducting gallium nano-precipitates

外电场对超导镓纳米沉淀硅的影响

DOI：
10.1063/5.0002460
发表时间：
2020
期刊：
Journal of Applied Physics
影响因子：
3.2
作者：
Thorgrimsson, Brandur;McJunkin, Thomas;MacQuarrie, E. R.;Coppersmith, S. N.;Eriksson, M. A.
通讯作者：
Eriksson, M. A.

Topological Andreev bands in three-terminal Josephson junctions

三端约瑟夫森结中的拓扑安德烈夫能带

DOI：
10.1103/physrevb.96.161406
发表时间：
2017
期刊：
Physical Review B
影响因子：
3.7
作者：
Xie, Hong-Yi;Vavilov, Maxim G.;Levchenko, Alex
通讯作者：
Levchenko, Alex

Controlled-Z gate for transmon qubits coupled by semiconductor junctions

用于通过半导体结耦合的传输量子位的受控 Z 门

DOI：
10.1103/physrevb.97.134518
发表时间：
2018
期刊：
Physical Review B
影响因子：
3.7
作者：
Qi, Zhenyi;Xie, Hong-Yi;Shabani, Javad;Manucharyan, Vladimir E.;Levchenko, Alex;Vavilov, Maxim G.
通讯作者：
Vavilov, Maxim G.