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Studies in History and Philosophy of Science Part B Studies in History and Philosophy of Modern Physics

A view from nowhere: quantum reference frames and uncertainty

Michael Dickson

Published Mar 25, 2004• 19 citations
Publisher
DOI
10.1016/j.shpsb.2003.12.003

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In General Relativity, relational constructions yield gauge-invariant Dirac observables by expressing physical fields relative to reference frames. This leaves open how the physical situations represented in different frames should be understood. I articulate two ontological interpretations within a common fibre-bundle framework, distinguishing \emph{frame-independence} from \emph{frame-freedom} to clarify appeals to perspective-neutrality. The \emph{View from Nowhere} treats the situations characterised by relational observables as partial aspects of a shared physical situation represented by a frame-free gauge-equivalence class. The \emph{View from Everywhere} takes each relational observable to characterise a comprehensive physical situation in its own right, without commitment to a shared frame-free reality. They articulate a qualified realisation of moderate and strong physical perspectivalism within GR, respectively. Using two GPS reference frames as a working example, I show that a physically constrained, frame-independent inter-frame map supplies a constructive counterexample to the claim that connecting perspectives requires frame-free structures in the ontology. The choice between the two interpretations remains open, with their ontological commitments made explicit. I conclude by outlining possible implications for quantum reference frames and relational quantum mechanics.
Viewing frames of reference as physical systems, subject to the same laws as the systems they describe, is central to the relational approach in physics. Under the assumption that quantum mechanics universally governs all physical entities, this perspective naturally leads to the concept of quantum reference frames (QRFs). We investigate the perspective-dependence of position and momentum uncertainties, correlations, covariance matrices, and entanglement within the QRF formalism. We show that the Robertson-Schrödinger uncertainty relations are frame-dependent, and so are correlations and variances, which satisfy various constraints described as inequalities. However, the determinant of the total covariance matrix, linked to the uncertainty volume in phase space, as well as variance-based entanglement criteria, remains invariant under changes of reference frame. Under specific conditions, the purities of subsystems are also invariant for different QRFs, but in general, they are perspective-dependent. These invariants suggest fundamental, robust measures of uncertainty and entanglement that persist despite changes in observational perspective, potentially inspiring dedicated quantum information protocols as well as further foundational studies.