Canonical purification of evaporating black holes

We show that the canonical purification of an evaporating black hole after Page time consists a short, connected, Lorentzian wormhole between two asymptotic boundaries, one which is unitarily related to radiation. This provides quantitative and general realization predictions $\mathrm{ER}=\mathrm{EPR}$ in time; this further gives standard $\mathrm{AdS}/\mathrm{CFT}$ calculation entropy radiation (without modifications homology constraint). Before time, disconnected, semiclassical holes. From this, we construct bipartite entangled holographic CFT states, with equal (and large) amount entanglement, where dual has connected ERB other does not. example, speculate measures multipartite entanglement may offer more complete picture into emergence spacetime.