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cond-mat.str-el2021
Linear-time generalized Hartree-Fock algorithm for quasi-one-dimensional systems
Alex Meiburg, Bela Bauer
In many approximate approaches to fermionic quantum many-body systems, such as Hartree-Fock and density functional theory, solving a system of non-interacting fermions coupled to s…
quant-ph2021
Quantum Constraint Problems can be complete for , , and more
Alex Meiburg
A quantum constraint problem is a frustration-free Hamiltonian problem: given a collection of local operators, is there a state that is in the ground state of each operator simulta…