The Triangular and Coulomb Bound Potential Quantum Dot Qubit

Li, Hongjuan; Yin, Jingzhou; Xiao, Jing‐Lin

doi:10.1007/s10909-013-0863-0

Cited by 3 publications

(1 citation statement)

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“…Xiao [12] investigated the influences of temperature and Coulomb bound potential on the properties of quantum rod qubit. Meanwhile, Li et al [13] studied the triangular and Coulomb bound potential QD qubit. From the above articles, it can be seen that the impurity effects on semiconductor qubit in low-dimensional semiconductor nano-materials are exceedingly important.…”

Section: Introductionmentioning

confidence: 99%

Impurity Effect of Asymmetric Gaussian Potential Quantum Well Qubit

Xiao

2015

J Low Temp Phys

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On the condition of strong electron-LO phonon coupling in an asymmetrical Gaussian potential quantum well (AGPQW) with a hydrogen-like impurity at the origin of the coordinate, we calculate the eigenenergies and the eigenfunctions of the ground and the first excited states (GFES) by using a variational method of Pekar type. A single qubit can be realized in this two-level quantum system. We calculate the time evolution and the change of the coordinate of the electron's probability density. When the electron is in the superposition state of the GFES, the electron's probability density oscillates in the AGPQW with a certain period T 0 = 20.716 fs. It turns out that due to the presence of the asymmetrical Gaussian potential in the growth direction of the QW, the electron probability density shows a single peak configuration in the coordinate range of z > 0, whereas it equals to zero in the range of z < 0. There is only one peak if the confinement is a two-dimensional symmetric structure in the x y plane of the QW. The oscillating period is a decreasing function of the strength of the Coulombic impurity potential, the height of the AGPQWs and the polaron radius. It is also a decreasing function of the above quantities for R < 0.24 nm, but becomes an increasing one for R > 0.24 nm. It has a minimum when R = 0.24 nm.

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Section: Introductionmentioning

confidence: 99%