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quant-ph2026
Quantum reference frames beyond subsystems: a reconstruction and generalization of the perspective-neutral framework
Stefan L. Ludescher, Manuel Mekonnen, Thomas D. Galley +1
We generalize the notion of quantum reference frames (QRFs) to cases where the frame does not necessarily correspond to a tensor factor subsystem, but to a covariant quantum instru…
quant-ph2026
Complete Relational Description of Spin in a Quantum Background
Hannah Troger, Ofek Bengyat, Thomas D. Galley +1
The standard description of the state of a spin in quantum mechanics presupposes externally fixed directions -- a classical background. Can a spin be fully described instead in rel…