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...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.展开更多
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 Kong,China(Grant Nos.HKU7058/11P and HKU7045/13P)+6 种基金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),Chinathe National Natural Science Foundation of China(Grant Nos.11074111,11023002,and 11004065)the Priority Academic Program Development of Jiangsu Higher Education Institutions,Chinathe Program for New Century Excellent Talents in University of Ministry of Education of Chinathe Program for Changjiang Scholars and Innovative Research Team in University,Chinathe Fundamental Research Funds for the Central Universities of Ministry of Education of China
文摘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.
