Decoherence by a non-Markovian and non-Gaussian Environment

non-Markovian;non-Gaussian;decoherence;Physics

Qiao, Wenling

University of Waterloo

关键词: non-Markovian;    non-Gaussian;    decoherence;    Physics;   

Others  :  https://uwspace.uwaterloo.ca/bitstream/10012/7294/1/Qiao_Wenling.pdf

瑞士|英语

来源: UWSPACE Waterloo Institutional Repository

【 摘 要 】

This thesis studies a spin-star model and an open spin-star model. The spin-star model is exactly solvable, and the approximation methods can be applied and compared with the exact solution. As this model is shown to be non-Gaussian and non-Markovian, Born-Markovian approximation is not valid. The comparison of Nakajima-Zwanzig and time-convolutionless methods show that the performances of those two techniques depend on the specific property of the model. The open spin-star model is not exactly solvable and the analytical solution under Gaussian approximation is obtained.