In the large-N limit, a Cartesian reference frame encoded in N spin-1/2 particles can be made partially objective for multiple observers, who agree up to relative rotations, but the extraction measurably disturbs the state.
Roads to objectivity: Quan- tum Darwinism, Spectrum Broadcast Struc- tures, and Strong quantum Darwinism – a review
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Towards objectivity of classical reference frames in quantum mechanics
In the large-N limit, a Cartesian reference frame encoded in N spin-1/2 particles can be made partially objective for multiple observers, who agree up to relative rotations, but the extraction measurably disturbs the state.