توليد درهم‌تنيدگي در پراكندگي ميدان تابشي همدوس از ناخالصي‌هاي موضعي ثابت

This thesis investigates the fundamental concept of entanglement generation during the scattering process. The first part addresses the entanglement generation resulting from the scattering of a Gaussian wave packet from a spin impurity via a Heisenberg interaction. The results indicate that the amount of entanglement, as measured by the negativity metric, is directly dependent on the initial width of the wave packet. This highlights the significance of initial state engineering for the control of quantum resources. The main part of the research is dedicated to analyzing the role of the superposition of coherent states in entanglement. To this end, the correspondence between a coherent state an‎d a Gaussian wave packet in position space is first established. Subsequently, the superposition of two coherent states is utilized to investigate its non-classical nature an‎d to analyze the amount of entanglement generation during the scattering process. For a precise eva‎luation of this non-classical nature, the Wigner distribution function is calculated for the superposition state; its negative values an‎d oscillatory structures serve as a testament to the existence of quantum interference. To quantify this feature, the "non-classical volume" metric is introduced. The key finding is that its value increases with the spatial separation between the states, eventually reaching a maximum an‎d stable value. It will be demonstrated that for the superposition of two Gaussian states (the position-space representation of two coherent states), the amount of entanglement generated during the scattering from the spin impurity can be controlled by varying the separation between the peaks of the Gaussian functions.

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