摘要：
We have obtained the parameter-phase diagram, which unambiguously defines the parameter region for the use of InAs/GaAs quantum dot as two-level quantum system in quantum computation in the framework of the effective-mass envelope function theory. Moreover, static electric field is found to efficiently prolong decoherence time. As a result, decoherence time may reach the order of magnitude of milli-seconds as external static electric field goes beyond 20 kV/cm if only vacuum fluctuation is taken as the main source for decoherence. Our calculated results are useful for guiding the solid-state implementation of quantum computing.
作者：
PAN Liu-xian 1, ZHOU Guang-hui 2, LI Shu-shen 3(1.Department of Physics, Yiyang Teacher’s College, Yiyang 413049;2. Department of Physics, Hunan Normal University, Changsha 410081;3. National Laboratory for Supperlattice and Microstructure, Chinese
期刊：
原子与分子物理学报,2002年19(1):79-82 ISSN：1000-0364
作者机构：
[PAN Liu-xian 1, ZHOU Guang-hui 2, LI Shu-shen 3(1.Department of Physics, Yiyang Teacher’s College, Yiyang 413049] Department of Physics, Yiyang Teacher's College;[Zhou Guanghui] Department of Physics, Hunan Normal University;[Li Shushen] 中科院半导体所
摘要：
Nonlinear wave equation for a one-dimensional anharmonic crystal lattice in terms of its microscopic parameters is obtained by means of a continuum approximation. Using a small time scale transformation, the nonlinear wave equation is reduced to a combined KdV equation and its single soliton solution yields the supersonic kink form of nonlinear elastic waves for the system.
关键词：
Coupled MKdV equation;Coupled KdV equations;Exact solutions;Trigonometric function transform method
摘要：
In this Letter, more exact solutions for a new coupled MKdV equations are obtained by using a direct and efficient trigonometric function transform method based on the idea of the homogeneous balance method. The corresponding exact Solutions for a coupled KdV equations are obtained by Miura transformation, with the aid of Mathematica. (C) 2002 Elsevier Science B.V. All rights reserved.
作者机构：
[潘留仙] Department of Physics, Hunan City College, Yiyang 413049, China;[周光辉] Department of Physics, Physics/Information Science College, Hunan Normal University, Changsha 410081, China;[李乐群] Hunan Propagating Medium Prof. Coll., Changsha 410000, China
摘要：
More new exact solutions for a class of nonlinear coupled differential equations are obtained by using a direct and efficient trigonometric function transform method based on the idea of the homogeneous balance method. (C) 2002 Elsevier Science B.V. All rights reserved.
