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All-electrically reading out and initializing topological qubits with quantum dots

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：O471.1[理学—半导体物理;理学—物理] TP334.8[自动化与计算机技术—计算机系统结构;自动化与计算机技术—计算机科学与技术]
作者机构：[1]National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China, [2]Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China, [3]Laboratory of Quantum Information Technology, and School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China
相关基金：Project supported by the National Basic Research Program of China （Grant Nos. 2011CB922100, 2011CBA00205, and 2013CB921804）, the General Research Fund （GRF） of the Research Grants Council （RGC） of Hong Koug, China （Grant Nos. HKU7058/11P and HKU7045/13P）, the Collaborative Research Fund （CRF） of the Research Grants Council （RGC） of Hong Kong, China （Grant No. HKU-8/11G）, the University Research Committee （URC） Fund of the Hong Kong University （HKU）, China, the National Natural Science Foundation of China （Grant Nos. 11074111, 11023002, and 11004065）, the Priority Academic Program Development of Jiangsu Higher Education Institutions, China, the Program for New Century Excellent Talents in University of Ministry of Education of China, the Program for Changjiang Scholars and Innovative Research Team in University, China, and the Fundamental Research Funds for the Central Universities of Ministrv of Education of China.

关键词：初始化过程, 量子点, 量子比特, 拓扑, 读出, 半导体纳米线, 栅极电压, 量子位, quantum dot, Majorana fermion, topological qubit

中文摘要：

We analyze the reading and initialization of a topological qubit encoded by Majorana fermions in one-dimensional semiconducting nanowires, weakly coupled to a single level quantum dot(QD). It is shown that when the Majorana fermions are fused by tuning gate voltage, the topological qubit can be read out directly through the occupation of the QD in an energy window. The initialization of the qubit can also be realized via adjusting the gate voltage on the QD, with the total fermion parity conserved. As a result, both reading and initialization processes can be achieved in an all-electrical way.

英文摘要：

We analyze the reading and initialization of a topological qubit encoded by Majorana fermions in one-dimensional semiconducting nanowires, weakly coupled to a single level quantum dot （QD）. It is shown that when the Majorana fermions are fused by tuning gate voltage, the topological qubit can be read out directly through the occupation of the QD in an energy window. The initialization of the qubit can also be realized via adjusting the gate voltage on the QD, with the total fermion parity conserved. As a result, both reading and initialization processes can be achieved in an all-electrical way.

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