Entanglement
Definition
Entanglement is a quantum link between systems, so that the state of the whole can’t be written as separate states of the parts.
On this site
The difference between the Mean-field rung, which treats particles as separate, and the Fully entangled rung, which doesn’t.
Role in the model
Entanglement is the gap between the Mean-field and Fully entangled rungs. Mean-field treats each particle as separate, and the total stays finite. Fully entangled admits they aren’t separate, and the exponent gets an exponent.
Related
14 short pages, one per thinker, each with its matching dial. See also the reading list.