Open AccessParabolic linear bound potential quantum dot qubit and its optical phonon effect
Author(s) -
Zi-Wu Wang,
JingLin Xiao
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.678
Subject(s) - excited state , physics , ground state , qubit , oscillation (cell signaling) , condensed matter physics , superposition principle , coupling constant , phase qubit , variational method , phonon , quantum dot , electron , charge qubit , quantum mechanics , flux qubit , constant (computer programming) , coupling (piping) , quantum , materials science , genetics , biology , metallurgy , computer science , programming language
On the condition of electric-LO phonon strong coupling in parabolic quantum dot, we obtain the eigenenergy and the eigenfuctions of the ground state and the first excited state by using variational method of Peakar type. This system in quantum dot may be employed as a two-level quantum system-qubit. When the electron is in the superposition state of the ground state and the first excited state, we obtain the time evolution of the electron density. It is shown that the period of oscillation decreases with the strength of coupling increasing when the confined length is constant. And the period of oscillation increases with the confined length increasing when the strength coupling is constant.