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• W2522754507 abstract "The main aim of this thesis is to study quantum dynamics, with a focus on irreversible, dissipative dynamics, by collecting repeated observations and arranging them to form a process. This leads to quantum states of extended models with some simplifying features. The models explored here are quantum spins on Fermionic lattices and chains of quantum spins. We focus in particular on the randomising properties of the dynamics. The thesis begins by exploring the relation between the average von Neumann and Renyi entropies of integer orders for shift-invariant quasi-free Fermionic lattice systems. This then leads to an investigation into approximating the von Neumann entropy in terms of a combination of integer-order Renyi entropies and an estimate for the quality of such an approximation is given. Later, a rather general technique is introduced to model a quantum system’s dynamics on a semi-infinite half-chain of quantum spins. Here, bounds are given for the average entropy of the model system as well as a general scheme for computing the average Renyi entropy of integer order of such models. Finally, the half-chain model is made explicit with the example of a simple qubit evolving under a thermalising dissipative dynamics. With this example, the integer-order Renyi entropies are explicitly calculated. By optimising over all possible choices of models, a model-independent expression for the average Renyi entropies is derived." @default.
• W2522754507 created "2016-09-30" @default.
• W2522754507 creator A5051159401 @default.
• W2522754507 date "2015-09-24" @default.
• W2522754507 modified "2023-09-27" @default.
• W2522754507 title "Dynamics of Quantum Correlations" @default.
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• W2522754507 hasPublicationYear "2015" @default.
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