Getting Started

Namespaces

The root module is split into feature namespaces:

• MPSToolkit.Evolution
• MPSToolkit.Observables
• MPSToolkit.ScarFinder
• MPSToolkit.Bases
• MPSToolkit.OperatorSpace
• MPSToolkit.Models
• MPSToolkit.Chebyshev

This layout is deliberate: evolution, projection, observables, and spectral tools stay composable instead of being fused into one control path.

Minimal TEBD Example

using MPSToolkit
using ITensors
using ITensorMPS

nsites = 6
sites = siteinds("S=1/2", nsites)
psi = MPS(sites, n -> isodd(n) ? "Up" : "Dn")

evolution = tebd_strang_evolution(
  nsites,
  0.05;
  local_hamiltonian=(bond, weight) -> weight * spinhalf_tfim_bond_hamiltonian(nsites, bond; J=1.0, g=0.8),
  maxdim=32,
  cutoff=1e-12,
)

evolve!(psi, evolution)
println(expect(psi, "Sz"))

Minimal Operator-Space Example

using MPSToolkit
using ITensors
using ITensorMPS

nsites = 6
sites = pauli_siteinds(nsites)
state = pauli_basis_state(sites, ["Z", "I", "I", "I", "I", "I"])

evolution = tebd_strang_evolution(
  nsites,
  0.05;
  local_hamiltonian=(bond, weight) -> weight * spinhalf_tfim_bond_hamiltonian(nsites, bond; J=1.0, g=0.8),
  map_hamiltonian=pauli_gate_from_hamiltonian,
  maxdim=64,
  cutoff=1e-12,
)

evolve!(state, evolution)

Next Steps

• For the package layout and shared algorithm split, see Architecture.
• For physical-state evolution, see TEBD And TDVP.
• For projection-and-refinement workflows, see ScarFinder.
• For operator-space workflows, see Operator Space.
• For operator-space projection MPOs, see DAOE.
• For operator-space truncation, see DMT.
• For spectral workflows, see Chebyshev.
• For runnable notebooks and scripts, see Examples.