Quantum Brascamp-Lieb Dualities

Michael Walter
Universiteit van Amsterdam

Brascamp-Lieb inequalities are entropy inequalities which have a dual formulation as generalized Young inequalities. In this work, we introduce a fully quantum version of this duality, relating quantum relative entropy inequalities to matrix exponential inequalities of Young type. We demonstrate this novel duality by means of examples from quantum information theory - including entropic uncertainty relations, strong data-processing inequalities, super-additivity inequalities, and many more. As an application we find novel uncertainty relations for Gaussian quantum operations that can be interpreted as quantum versions of the well-known family of geometric Brascamp-Lieb inequalities. Joint work with Mario Berta and David Sutter.

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