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Eigenstate thermalization, quantum designs and free probability

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The Eigenstate Thermalization Hypothesis needs to be completed to take into account higher correlators, for example to compute out of time order operators (OTOCs). Once this is done, a Pandora’s box of contributions is opened. As it turns out, the instrument for organizing this has been around for a few decades: it is the technique of Free Probability. Once Free Probability is taken on board, one finds an immediate connection with Unitary Designs, a construction of a set of unitary matrices that can be taken as a proxy for the whole unitary group, a subject that has attracted considerable interest in quantum information.

This talk is part of the Theory of Condensed Matter series.

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