|
|||||
|
|
Quantum computing through electron propagation in edge states of quantum spin Hall systems |
|
| Authors: | Wei?Chen,Zheng-Yuan?Xue,Z.D.?Wang,Rui?Shen author-information" > author-information__contact u-icon-before" > mailto:shen@nju.edu.cn" title=" shen@nju.edu.cn" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Ding Yu?Xing |
| Affiliation: | 1.National Laboratory of Solid State Microstructures and Departmentof Physics, Nanjing University,Nanjing,P.R.China;2.Department of Physics and Center of Theoretical and ComputationalPhysics,The University of Hong Kong,Hong Kong,P.R.China;3.Laboratory of Quantum Engineering and Quantum Materials, andSchool of Physics and Telecommunication Engineering, South China Normal University,Guangzhou,P.R.China |
| Abstract: | We propose to implement quantum computing by the on-demand control of the wave packets propagation in helical edge channels of the quantum spin Hall systems (QSHs). Two non-commutative single-qubit gates are realized by the gate voltages applied on the edge channels. The two-qubit controlled phase gate is implemented by the capacitive Coulomb interaction between two adjacent edge channels from two parallel QSHs. A universal set of quantum gates thus can be realized in an all-electrical way. It is also shown that the fidelity and the purity of the controlled phase gate can reach a high value, with both the time delay and the finite width of the wave packets taken into account. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |