Hi all, Next week, Leonardo Valente will talk about “Towards Information Measures for Quantum Reference Frames”. See below for the abstract. The talk will take place on Monday at 15:00 in HIT K 52. Best, Ladina %%%%%%%%%% Title: Towards Information Measures for Quantum Reference Frames Abstract: We explore methods for extending von Neumann information measures to systems without a single tensor-product structure, focusing specifically on Quantum Reference Frame (QRF) settings. In particular, we seek a meaningful notion of mutual information defined across different QRFs. To address this challenge, we propose two distinct approaches. First, we introduce QI-Measures, a framework that establishes a set-theoretic structure for von Neumann information quantities, revealing unexpected implications for strong subadditivity and operational interpretations, while extending entropic measures to new contexts. Second, we utilise an algebraic approach to identify subsystems within QRFs, thereby defining an extension of mutual information applicable to the non-factor algebras inherent in these relational settings. Together, these frameworks provide a robust basis for quantifying information in the absence of a fixed subsystem structure, uncovering previously unexplored informational properties of quantum systems.