Computational Difficulty of Finding Matrix Product Ground States

Author(s): N. Schuch, J. I. Cirac, F. Verstraete

Journal: Physical Review Letters

Volume: 100

Page(s): 250501

Year: 2008

DOI Number: 10.1103/PhysRevLett.100.250501

Link: Link to publication


We determine the computational difficulty of finding ground states of one-dimensional (1D) Hamiltonians, which are known to be matrix product states (MPS). To this end, we construct a class of 1D frustration-free Hamiltonians with unique MPS ground states and a polynomial gap above, for which finding the ground state is at least as hard as factoring. Without the uniqueness of the ground state, the problem becomes NP complete, and thus for these Hamiltonians it cannot even be certified that the ground state has been found. This poses new bounds on convergence proofs for variational methods that use MPS.


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