A theory of the pseudogap metal in the hole doped cuprate

We propose a new theoretical framework for the pseudogap metal in the hole doped cuprate.  Our theory is based on a recently devloped parton description using hidden layers.  We introduce two ancilla qubits per square lattice site, and employ them to obtain a variational wave function of a fractionalized Fermi liquid for the pseudogap metal state.  The theory describes not only the fractionalized Fermi liquid, but also the conventional Fermi liquid, and possible exotic intermediate phases and critical points. The fractionalized Fermi liquid has hole pockets with quasiparticle weight which is large only on Fermi arcs, and fermionic spinon excitations, which carry charges of the emergent gauge fields.