  Possible connections between quantum entanglement and cosmological eras are
considered. In particular, assuming that two epochs are each other entangled,
by measuring the entanglement degree, it is possible to recover dynamical
properties of the universe. In particular, the effects of dark energy could be
due to the entanglement between states, since a negative pressure arises at
late times. In this process, we choose as ruler to quantify the entanglement
weight, the so called negativity of entanglement. It follows that a natural
anti-gravitational effect occurs when the cosmological eras are entangled.
Thus, dark energy could be seen as a straightforward consequence of
entanglement. Specifically, our results can be compared with observational
data. In doing so, it is possible to show that a pressureless term is recovered
at a certain epoch dominating over dark energy and ruling the structure
formation.
