Quantum reference frames need not be subsystems: covariant instruments suffice, recovering the perspective-neutral framework operationally and enabling labeling frames and exact interacting relational clocks.
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Quantum reference frames beyond subsystems: a reconstruction and generalization of the perspective-neutral framework
Quantum reference frames need not be subsystems: covariant instruments suffice, recovering the perspective-neutral framework operationally and enabling labeling frames and exact interacting relational clocks.