采用Pekaur类型的变分方法,在抛物量子点中电子与体纵光学声子(LO)强耦合的条件下,得出了电子的基态,第一激发态的能量及相应的波函数.讨论了电子-声子耦合强度,量子点受限长度对电子在基态10＞，激发态|1＞，叠加态1/√2(|0)+|1＞)时的概率密度分布的影响.结果显示叠加态时的概率密度随着电子声子耦合强度的增加而增大,随着量子点受限长度的减小而增大.该结果对以量子点制备量子比特有一定的指导意义.
On the condition of electron-LO phonon strong coupling in a parabolic quantum dot,the eigenenergies and eigenfuctions of the ground state and first excited state using variational method of Pekar type were obtained.The system in quantum dot may be employed as a two-level quantum system qubit.The relations on the electron-LO phonon strong coupling,the confinement length with the electron probability density were investigated.The results indicate that the electron probability density increases with increasing the electron-LO phonon strong coupling and decreasing the confinement length.The results are meaningful for preparing a qubit.
参考文献
| [1] | Johjnson N F,Quantum dots:few-body,low-dimensional systems[J].J.Phys.:Condens.,Matter.,1995,7(6):965-990. |
| [2] | Hu Yiga,Yin Jiwen,Xiao Jinglin.Average number of optical phonons of weak-coupling impurity bound magnetopolaron in a parabolic quantum dot[J].Chinese Journal of Quantum Electronics(量子电子学报),2009,26(5):636-640(in Chinese). |
| [3] | Senes M,Smith K L,Smeeton T N,et al.Strong carrier confinement in In_xGa_(1-x)N/GaN quantum dots grown by molecular beam epitaxy[J].Phys.Rev.B,2007,75(4):045314-1-5. |
| [4] | Potz W,Control of the non-Markovian dynamics of a qubit[J].Appl.Phys.Lett.,2006,89(25):254102-1-3. |
| [5] | Li Shushen,Wu Xiaoguang,Zheng Houzhi.Recent progress in solid-state quantum computing[J].Physics(物理),2004,33(6):404-408(in Chinese). |
| [6] | Amico D.Quantum dot-based quantum buses for quantum computer hardware architecture[J].Irene.Microelectronics Journal,2006,37(12):1440-1441. |
| [7] | LiSS,Xia J B,Yang F H,et al.InAs/GaAs single-electron quantum dot qubit[J].J.Appl.Phys.,2001,90(12):6151-6155. |
| [8] | LiSS,Xia J B,Feng S L,et al.Quantum computing[J].Pro.Natl.Acad.Sci.USA,2001,98(21):11847-11850. |
| [9] | Chow J M,Gambetta L,Tornberg J K,et al.Randomized benchmarking and process tomography for gate errors in a solid-state qubit[J].Phys.Rev.Lett.,2009,102(9):090502-090505. |
| [10] | Riedmatten H D,Afzelius M,Staudt M U,et al.A solid-state lightmatter interface at the single-photon level[J].Nature,2008,456:773-777. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%