The decoherence of the triangular and Coulomb bound potential quantum dot qubit  

作　　者：李红娟 孙家奎 肖景林 

机构地区：[1]College of Physics and Electromechanics,Inner Mongolia National University

出　　处：《Chinese Physics B》2010年第1期100-103,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 10347004);the Research Science Project for the Colleges and Universities of Inner Mongolia Autonomous Region (Grant No. NJzy08085)

摘　　要：We study the eigenenergies and eigenfunctions of the ground and first-excited states of an electron which is strongly coupled to an LO-phonon in a quantum dot with a triangular bound potential and Coulomb bound potential by using the Pekar variational method. This system may be used as a two-level qnbit. Phonon spontaneous emission causes the decoherence of the qubit. Numerical calculations are performed on the decoherence rate as a function of the polar angle, the Coulomb binding parameter, the coupling strength, the confinement length of the quantum dot and the dispersion coefficient.We study the eigenenergies and eigenfunctions of the ground and first-excited states of an electron which is strongly coupled to an LO-phonon in a quantum dot with a triangular bound potential and Coulomb bound potential by using the Pekar variational method. This system may be used as a two-level qnbit. Phonon spontaneous emission causes the decoherence of the qubit. Numerical calculations are performed on the decoherence rate as a function of the polar angle, the Coulomb binding parameter, the coupling strength, the confinement length of the quantum dot and the dispersion coefficient.

关 键 词：quantum dot triangular bound potential Coulomb bound potential DECOHERENCE 

分 类 号：O431.2[机械工程—光学工程] O471.1[理学—光学]