Rényi mutual information in quantum field theory, tensor networks, and gravity
arXiv:2308.08600 · doi:10.1007/JHEP06(2024)195
Abstract
We explore a large class of correlation measures called the Rényi mutual informations (RMIs). Unlike the commonly used notion of RMI involving linear combinations of Rényi entropies, the RMIs are positive semi-definite and monotonically decreasing under quantum operations, making them sensible measures of total (quantum and classical) correlations. This follows from their descendance from Rényi relative entropies. In addition to upper bounding connected correlation functions between subsystems, we prove the much stronger statement that for certain values of and , the RMIs also lower bound connected correlation functions. We develop an easily implementable replica trick which enables us to compute the RMIs in a variety of many-body systems including conformal field theories, free fermions, random tensor networks, and holography.
arXiv comment20 pages, 3 figures
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