R\'enyi mutual information in quantum field theory, tensor networks, and gravity

Autor:	Kudler-Flam, Jonah, Nie, Laimei, Vijay, Akash
Rok vydání:	2023
Předmět:	High Energy Physics - Theory Condensed Matter - Statistical Mechanics Quantum Physics
Druh dokumentu:	Working Paper
DOI:	10.1007/JHEP06(2024)195
Popis:	We explore a large class of correlation measures called the $\alpha-z$ R\'enyi mutual informations (RMIs). Unlike the commonly used notion of RMI involving linear combinations of R\'enyi entropies, the $\alpha-z$ 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 R\'enyi relative entropies. In addition to upper bounding connected correlation functions between subsystems, we prove the much stronger statement that for certain values of $\alpha$ and $z$, the $\alpha-z$ RMIs also lower bound connected correlation functions. We develop an easily implementable replica trick which enables us to compute the $\alpha-z$ RMIs in a variety of many-body systems including conformal field theories, free fermions, random tensor networks, and holography. Comment: 20 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2308.08600 Zobrazit plný text záznamu View this record from Arxiv