Graduate Thesis Or Dissertation
 

Redundant information in a spin system beyond pure decoherence

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z603r113v

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  • Quantum physics in the Copenhagen interpretation places an unsatisfying divide between the quantum and classical worlds. Decoherence -- the destruction of superposition states of the system -- helps us understand how the quantum transitions to the classical. Quantum Darwinism builds on decoherence to understand how information about the system is deposited in the environment. This gives a framework to describe the emergence of objective, classical reality from the fundamentally unpredictable quantum domain. Considering a model of a qubit interacting with a symmetric spin environment, we study how information about the system is transferred into the environment when the system has intrinsic dynamics. That is, we examine a model beyond "pure decoherence". We develop a computational technique to compute the mutual information between the system and a fragment of the environment as a function of the strength of the system's Hamiltonian. The intrinsic dynamics of the system influences the proliferation of information. However, there is always a redundant transfer of information for a weak system Hamiltonian. Only when the system evolves so rapidly that the environment can not effectively monitor its state does redundancy vanish.
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