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Accepted · first revision · record

Title: Quantum reference frame changes for general and imperfect frames
Plain: Describing physics from the viewpoint of a quantum particle needs rules for switching viewpoints. Several frameworks give such rules for idealized frames; for realistic frames such as small quantum clocks they disagree or are undefined.
Precise: Construct transformations between quantum reference frames for arbitrary symmetry groups (including non-Abelian, e.g. SU(2) rotations) and non-ideal frames (finite-dimensional, with non-orthogonal orientation states), and prove equivalence or a precise relation between the perspective-neutral (constraint-based), operational and perspectival approaches. An answer is one framework with proofs that each existing one is a special case, or a stated inequivalence.
Settled by: Published theorems relating the frameworks for general groups and non-ideal frames.
Kind: well-posed
Answer type: proof
References: (empty)
Literature status: partially-resolved
Status note: Frameworks for general groups and some non-ideal frames exist; their full equivalence is proved only for restricted classes of frames.
Posed since: (empty)