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All-electrically reading out and initializing topological qubits with quantum dots
作者姓名:陈伟  薛正远  汪子丹  沈瑞
基金项目: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.
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.

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

All-electrically reading out and initializing topological qubits with quantum dots
Abstract: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.
Keywords:quantum dot  Majorana fermion  topological qubit
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