ER = EPR is a conjecture in physics stating that two entangled particles (a so-called Einstein–Podolsky–Rosen or EPR pair) are connected by a wormhole (or Einstein–Rosen bridge)[1][2] and is thought by some to be a basis for unifying general relativity and quantum mechanics into a theory of everything.
This conjecture is an extrapolation of the observation by Mark Van Raamsdonk[6] that a maximally extended AdS-Schwarzschild black hole, which is a non-traversable wormhole, is dual to a pair of maximally entangled thermal conformal field theories via the AdS/CFT correspondence.
Susskind and Maldacena envisioned gathering up all the Hawking particles and smushing them together until they collapse into a black hole.
Entanglement overload is averted, and the firewall problem goes away.This conjecture sits uncomfortably with the linearity of quantum mechanics.
[8] The authors pushed this conjecture even further by claiming any entangled pair of particles—even particles not ordinarily considered to be black holes, and pairs of particles with different masses or spin, or with charges which aren't opposite—are connected by Planck scale wormholes.