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Entanglement Survival Time in Landau-Zener Model in the Presence of Dissipation
, M.Sc. Thesis Sharif University of Technology ; Memarzadeh, Laleh (Supervisor)
Abstract
Entanglement is one of the unique phenomena in quantum systems that does not have any similar phenomena in classical systems. Entanglement has been used in many protocols of quantum information theory, and there is agreement on its key role in quantum computations and quantum communication protocols. Therefore, studying its dynamics as well as preventing its degradation is important for us. Extensive studies have been done in this field, including the study of entanglement evolution in a situation where all parts of the system are entangled with one of its sub-system has irreversible dynamics due to interaction with its environment [1], [2], [3], [4], [5], [6], [7], [8]. However, the study...
Entanglement degradation under local dissipative Landau-Zener noise
, Article Physical Review A ; Volume 110, Issue 1 , 2024 ; 24699926 (ISSN) ; Kashef, A ; Memarzadeh, L ; Sharif University of Technology
2024
Abstract
We study entanglement degradation when one share of an entangled pair experiences noise. We consider the dissipative Landau-Zener model for describing local noise. The dissipative Landau-Zener model provides a convenient setting for modeling entanglement degradation with applications in quantum network developments and communications. Here, we study the problem in the fast- and slow-driving regimes. In the slow-driving regime, our results are analytical, while in the fast-driving regime, we use numerical techniques to obtain the results. Our study addresses the role of two main properties of the dynamics in entanglement degradation, namely, spin-coupling direction and adiabaticity of the...