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A simple, general and practically exact method, Entanglement PerturbationTheory (EPT), is formulated to calculate the ground states of 2D macroscopicquantum systems with translational symmetry. An emphasis will be placed on theapplicability of EPT to fermions. We will discuss some preliminary evidenceswhich indicate a potential of EPT.

Entanglement perturbation theory for the quantum ground states in two dimensions