ZHANG Ying,HAN Chao,Eerdunchaolu.Characteristics of strong-coupling bipolaron qubit in two-dimensional quantum dot in electric field[J].Optoelectronics Letters,2015,11(5):386-389 Characteristics of strong-coupling bipolaron qubit in two-dimensional quantum dot in electric field Author Name Affiliation ZHANG Ying  Department of Physics, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China  HAN Chao  Department of Physics, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China  Eerdunchaolu  Department of Physics, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China  Abstract:       Based on Lee-Low-Pines (LLP) unitary transformation, this article adopts the variational method of the Pekar type and gets the energy and wave functions of the ground state and the first excited state of strong-coupling bipolaron in two-dimensional quantum dot in electric field, thus constructs a bipolaron qubit. The numerical results represent that the time oscillation period T0 of probability density of the two electrons in qubit decreases with the increasing electric field intensity F and dielectric constant ratio of the medium ; the probability density Q of the two electrons in qubit oscillates periodically with the increasing time t; the probability of electron appearing near the center of the quantum dot is larger, while that appearing away from the center of the quantum dot is much smaller. Hits: 3816 Download times: 0 This work has been supported by the Natural Science Foundation of Hebei Province (No.E2013407119) and the Items of Institution of Higher View Full Text    Download reader