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All-electrically reading out and initializing topological qubits with quantum dots |
| Chen Wei (陈伟)a b, Xue Zheng-Yuan (薛正远)b c, Wang Z. D.(汪子丹)b, Shen Rui (沈瑞)a |
a National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;
b Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China;
c Laboratory of Quantum Information Technology, and School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China |
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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.
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Received: 07 October 2013
Revised: 04 December 2013
Accepted manuscript online:
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PACS:
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03.67.Lx
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(Quantum computation architectures and implementations)
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71.10.Pm
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(Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.))
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74.45.+c
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(Proximity effects; Andreev reflection; SN and SNS junctions)
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| Fund: 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), 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 Ministry of Education of China. |
Corresponding Authors:
Wang Z. D., Shen Rui
E-mail: zwang@hku.hk;shen@nju.edu.cn
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Cite this article:
Chen Wei (陈伟), Xue Zheng-Yuan (薛正远), Wang Z. D.(汪子丹) , Shen Rui (沈瑞) All-electrically reading out and initializing topological qubits with quantum dots 2014 Chin. Phys. B 23 030309
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