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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 |
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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.
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Received: 06 May 2009
Revised: 05 July 2009
Accepted manuscript online:
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PACS:
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73.21.La
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(Quantum dots)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.67.Lx
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(Quantum computation architectures and implementations)
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63.22.-m
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(Phonons or vibrational states in low-dimensional structures and nanoscale materials)
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| Fund: 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). |
Cite this article:
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 2010 Chin. Phys. B 19 010314
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