Figure 4: Equivalence of entanglement preservation and single system decoherence.
It is known31 that decoherence on a single quantum system can be understood fully as the process’ inability to preserve entanglement (for further background information see Supplementary Note 1). It is for this reason that our test for decoherence is fully general. In particular, it could also be applied to collapse models or any other form of decoherence. We emphasize gravitational decoherence, because here there is a pressing motivation for considering theories that modify or extend quantum mechanics.
