TL;DR
This paper discusses how the universe's big bang cosmology leads to widespread entanglement among particles, with most particles entangled with many others beyond our horizon, yet pairwise entanglement remains rare.
Contribution
It reveals the large-scale entanglement structure of the universe and explains why pairwise entanglement is typically absent despite widespread entanglement.
Findings
Particles are highly entangled with many others outside the horizon.
Entanglement is distributed uniformly across particles.
Most pairs of particles are likely to be separable, not entangled.
Abstract
We show that big bang cosmology implies a high degree of entanglement of particles in the universe. In fact, a typical particle is entangled with many particles far outside our horizon. However, the entanglement is spread nearly uniformly so that two randomly chosen particles are unlikely to be directly entangled with each other -- the reduced density matrix describing any pair is likely to be separable.
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