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This paper studies the two-electron total energy and the energy of the electron-electron interaction by using a variational method of Pekar type on the condition of electric-LO-phonon strong coupling in a parabolic quantum dot.It considers the following three cases:1) two electrons are in the ground state;2) one electron is in the ground state,the other is in the first-excited state;3) two electrons are in the first-excited state.The relations of the two-electron total energy and the energy of the electron-electron interaction on the Coulomb binding parameter,the electron-LO-phonon coupling constant and the confinement length of the quantum dot are derived in the three cases.  相似文献   
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采用Pekar类型的变分方法,在电子与体纵光学声子强耦合的条件下,计算得出了抛物量子点中电子的基态能量和第一激发态能量及其相应的本征波函数.量子点中这样的二能级体系可以作为一个量子比特.由于声子的自发辐射,造成量子比特的消相干,讨论了消相干时间与库仑结合参数,耦合强度,受限长度,色散系数的变化关系. 关键词: 量子点 量子比特 量子信息 消相干  相似文献   
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抛物线性限制势量子点量子比特及其光学声子效应   总被引:10,自引:0,他引:10       下载免费PDF全文
王子武  肖景林 《物理学报》2007,56(2):678-682
在抛物量子点中电子与体纵光学声子强耦合的条件下,应用Peaker变分方法得出了电子的基态和第一激发态的本征能量及基态和第一激发态本征波函数.量子点中这样的二能级体系可作为一个量子比特.当电子处于基态和第一激发态的叠加态时,计算出电子在空间的概率分布作周期性振荡.并且得出了振荡周期随受限长度及耦合强度的变化关系. 关键词: 量子点 量子信息 量子比特  相似文献   
4.
The influence of electric field on a parabolic quantum dot qubit   总被引:1,自引:0,他引:1       下载免费PDF全文
This paper calculates the time evolution of the quantum mechanical state of an electron by using variational method of Pekar type on the condition of electric-LO-phonon strong coupling in a parabolic quantum dot. It obtains the eigenenergies of the ground state and the first-excited state, the eigenfunctions of the ground state and the first- excited state This system in a quantum dot may be employed as a two-level quantum system qubit. The superposition state electron density oscillates in the quantum dot with a period when the electron is in the superposition state of the ground and the first-excited state. It studies the influence of the electric field on the eigenenergies of the ground state, the first-excited state and the period of oscillation at the different electron-LO-phonon coupling constant and the different confinement length.  相似文献   
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王子武  肖景林 《发光学报》2007,28(5):647-650
根据Pekar类型变分法在电子与声子强耦合的条件下计算了抛物量子点中强耦合极化子的基态能量.讨论了电子-声子耦合强度,量子点受限长度对基态能量的影响,同时引进温度参数并讨论了其对基态能量的影响,结果得出在低温的条件下,耦合强度和受限长度对基态的能量影响起主要作用;在高温的条件下,温度对基态的能量影响起主要作用,而耦合强度与受限长度的影响很小.  相似文献   
6.
This paper reports that the ground-state energy of polaron was obtained with strong electron-LO-phonon coupling by using a variational method of the Pekar type in a parabolic quantum dot. Quantum transition is occurred in the quantum system due to the electron-phonon interaction and the influence of temperature. That is the polaron transit from the ground-state to the first-excited state after absorbing a LO-phonon and it causes the change of the polaron lifetime. Numerical calculations are performed and the results illustrate that the ground-state lifetime of the polaron will increase with increasing the ground-state energy of polaron and decrease with increasing the electron-LO-phonon coupling strength, the confinement length of the quantum dot and the temperature.  相似文献   
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