Universal structure of objective states in all fundamental causal theories
Abstract
A crucial question is how objective and classical behavior arises from a fundamental physical theory. Here we provide a natural definition of a decoherence process valid in all causal theories and show how its behavior can be extremely different from the quantum one. Remarkably, despite this, we prove that the so-called spectrum broadcast structure characterizes all objective states in every fundamental causal theory, exactly as in quantum mechanics. Our results show a stark contrast between the extraordinarily diverse decoherence behavior and the universal features of objectivity.
- Publication:
-
Physical Review Research
- Pub Date:
- August 2021
- DOI:
- 10.1103/PhysRevResearch.3.033148
- Bibcode:
- 2021PhRvR...3c3148S