The decoherence of the triangular and Coulomb bound potential quantum dot qubit

doi:10.1088/1674-1056/19/1/010314

中国物理B ›› 2010, Vol. 19 ›› Issue (1): 10314-010314.doi: 10.1088/1674-1056/19/1/010314

The decoherence of the triangular and Coulomb bound potential quantum dot qubit

李红娟, 孙家奎, 肖景林

College of Physics and Electromechanics, Inner Mongolia National University, Tongliao 028043, China

收稿日期:2009-05-06 修回日期:2009-07-05 出版日期:2010-01-15 发布日期:2010-01-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10347004) and the Research Science Project for the Colleges and Universities of Inner Mongolia Autonomous Region (Grant No. NJzy08085).

The decoherence of the triangular and Coulomb bound potential quantum dot qubit

Li Hong-Juan(李红娟), Sun Jia-Kui(孙家奎)^†, and Xiao Jing-Lin(肖景林)^‡

College of Physics and Electromechanics, Inner Mongolia National University, Tongliao 028043, China

Received:2009-05-06 Revised:2009-07-05 Online:2010-01-15 Published:2010-01-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10347004) and the Research Science Project for the Colleges and Universities of Inner Mongolia Autonomous Region (Grant No. NJzy08085).

摘要/Abstract

摘要： We study the eigenenergies and eigenfunctions of the ground and first-excited states of an electron which is strongly coupled to an LO-phonon in a quantum dot with a triangular bound potential and Coulomb bound potential by using the Pekar variational method. This system may be used as a two-level qubit. Phonon spontaneous emission causes the decoherence of the qubit. Numerical calculations are performed on the decoherence rate as a function of the polar angle, the Coulomb binding parameter, the coupling strength, the confinement length of the quantum dot and the dispersion coefficient.

Abstract: We study the eigenenergies and eigenfunctions of the ground and first-excited states of an electron which is strongly coupled to an LO-phonon in a quantum dot with a triangular bound potential and Coulomb bound potential by using the Pekar variational method. This system may be used as a two-level qubit. Phonon spontaneous emission causes the decoherence of the qubit. Numerical calculations are performed on the decoherence rate as a function of the polar angle, the Coulomb binding parameter, the coupling strength, the confinement length of the quantum dot and the dispersion coefficient.

Key words: quantum dot, triangular bound potential, Coulomb bound potential, decoherence

中图分类号: (Quantum dots)

73.21.La

03.65.Yz (Decoherence; open systems; quantum statistical methods) 03.67.Lx (Quantum computation architectures and implementations) 63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)

李红娟, 孙家奎, 肖景林. The decoherence of the triangular and Coulomb bound potential quantum dot qubit[J]. 中国物理B, 2010, 19(1): 10314-010314.

Li Hong-Juan(李红娟), Sun Jia-Kui(孙家奎), and Xiao Jing-Lin(肖景林). The decoherence of the triangular and Coulomb bound potential quantum dot qubit[J]. Chin. Phys. B, 2010, 19(1): 10314-010314.

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The decoherence of the triangular and Coulomb bound potential quantum dot qubit

The decoherence of the triangular and Coulomb bound potential quantum dot qubit

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