Open AccessThe temperature effect of the parabolic linear bound potential quantum dot qubit
Author(s) -
YingJie Chen,
JingLin Xiao
Publication year - 2008
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.57.6758
Subject(s) - excited state , ground state , physics , qubit , condensed matter physics , quantum dot , electron , phase qubit , electron density , flux qubit , charge qubit , variational method , superposition principle , principal quantum number , quantum , quantum mechanics , atomic physics , quantum dissipation
On the condition of electric-LO phonon strong coupling in parabolic quantum dotwe obtain the eigenenergy and the eigenfuctions of the ground state and the first-excited state by using variational method of Pekar 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 statewe obtain the space-time evolution of the electron density. It is shown that the electron density increases with the temperature when the temperature is lowerand the electron density decreases with the temperature when the temperature is higher. At the same timewe found that sometimes the electron density vibrates with the temperatureand its change is slowed down with the strength of coupling increasing.