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Center for Nonlinear Studies |
Many of the differences between the quantum and classical worlds are most visible when studying measurements. For example, classical measurements are repeatable and their outcomes are objective, whereas only measurements of quantum systems which exhibit quantum Darwinism have these properties and so support the emergence of classicality. Another difference is that the outcomes of sets of classical measurements can always be described with joint probability distributions, whereas sets of quantum measurements may require quasiprobabilities. Only some quantum models appear classical in the sense that they only require ordinary probabilities to describe joint measurements. In this talk, I will take these two notions of how a quantum model may appear effectively classical and provide a broad classification of Hamiltonians which support them. Interestingly, the two approaches each lead to exactly the same set of Hamiltonians, implying that these properties of classical measurements are deeply related.
Bio: Emery Doucet is a postdoctoral research associate at the University of Maryland Baltimore County working as part of the Quantum Thermodynamics group run by Prof. Sebastian Deffner. His current research is primarily focused in two directions: one a foundational direction studying the emergence of classical behavior in quantum systems, especially through the lens of Quantum Darwinism; and the other an applied direction focused on practical applications of NISQ-era devices. He received his Ph.D. from the University of Massachusetts Lowell in 2023, where he studied nuclear physics as well as quantum state preparation.
Host: Akram Touil (T-4)