Hi all, On Monday, Apostolos Giovanakis will talk about “What is accessible from the perspective of a non-ideal QRF?”. See below for the abstract. The talk will take place on Monday at 15:00 in HIT K52. Best, Ladina %%%%%%%%%% Title: What is accessible from the perspective of a non-ideal QRF? Abstract: A central question in the study of quantum information theory in the presence of symmetries concerns which properties of a system can be inferred by observers without access to the laboratory frame. We investigate this question by introducing the relational observables described from the perspective of a quantum reference frame (QRF). However, non-ideal (spatial) QRFs have finite resources and cannot keep track of position perfectly. This might suggest that they are operationally less useful than reference frames with infinite resources that are often considered. In this talk, I will explore whether the opposite is possible: are there any features that arise in the non-ideal case that are absent in the ideal one, thereby rendering non-ideal QRFs more advantageous? More generally, I will discuss how an observer can operationally describe and access observables relative to a non-ideal QRF.