Author(s): Xiang Li, Ting-Chun Lin, and John McGreevy Ground states of $1+1d$ conformal field theories (CFTs) satisfy a local entropic condition called the vector fixed point equation. This condition is surprisingly well satisfied by ground states of quantum critical lattice models even at small system sizes. We perform a search in the space of states … [Phys. Rev. Lett. 137, 121601] Published Wed Sep 16, 2026