Variational quantum Monte Carlo simulations with tensor-network states

Details Variational quantum Monte Carlo simulations with tensor-network states Variational quantum Monte Carlo simulations with tensor-network states

2007-08-16

arxiv.org/abs/0708.2232v2

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 2 figures. v2: improved data, comparisons with exact results, to appear in Phys Rev Lett

Scientific paper

10.1103/PhysRevLett.99.220602

We show that the formalism of tensor-network states, such as the matrix product states (MPS), can be used as a basis for variational quantum Monte Carlo simulations. Using a stochastic optimization method, we demonstrate the potential of this approach by explicit MPS calculations for the transverse Ising chain with up to N=256 spins at criticality, using periodic boundary conditions and D*D matrices with D up to 48. The computational cost of our scheme formally scales as ND^3, whereas standard MPS approaches and the related density matrix renromalization group method scale as ND^5 and ND^6, respectively, for periodic systems.

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