- #1
Grinkle
Gold Member
- 772
- 223
kimbyd said:But quantum mechanics, as far as we know, has a property called unitarity: if I know the exact state of the system at time T, then I can, given enough computer power, calculate the precise state of the system at any other time, no matter what.
Quote lifted from a thread in the cosmology forum.
What does it mean to know the exact state of a QM system? QM predicts probabilities that particles will be in one of multiple states when the particles are observed, and when observed, not all properties of a particle are simultaneously knowable to an exact degree (eg position and momentum).
Does knowing the exact state mean I know the probability functions for each particle in a given system, or is it different than that?