A change of perspective: switching quantum reference frames via a perspective-neutral framework
Augustin Vanrietvelde, Philipp A Hoehn, Flaminia Giacomini, Esteban, Castro-Ruiz

TL;DR
This paper develops a unifying, perspective-neutral framework for describing quantum reference frames, enabling transformations between them and exploring their implications in quantum gravity and foundations.
Contribution
It introduces a symmetry-based, perspective-neutral approach to quantum reference frames, linking classical and quantum descriptions within a unified formalism.
Findings
Recovered quantum frame transformations within a simple model
Illustrated how entanglement depends on quantum reference frames
Proposed a new interpretation of Dirac and reduced quantized theories
Abstract
Treating reference frames fundamentally as quantum systems is inevitable in quantum gravity and also in quantum foundations once considering laboratories as physical systems. Both fields thereby face the question of how to describe physics relative to quantum reference systems and how the descriptions relative to different such choices are related. Here, we exploit a fruitful interplay of ideas from both fields to begin developing a unifying approach to transformations among quantum reference systems that ultimately aims at encompassing both quantum and gravitational physics. In particular, using a gravity inspired symmetry principle, which enforces physical observables to be relational and leads to an inherent redundancy in the description, we develop a perspective-neutral structure, which contains all frame perspectives at once and via which they are changed. We show that taking the…
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