Mainly usefull for testing the other approaches; Should support all observables, but limited in time/system size
- ising-type interaction mps/mpo
- brickwork mps/mpo
If the system is non-interacting one can calculate observables in polynomic time.
Benchmark for approximative methods, Usefull in regimes where those approximations don't work well
Efficient approximations near low entanglement points
- ising-type interaction mps/mpo
- brickwork mps/mpo
Calculate influence matrix elements using the quantum echo representation works only for short systems but for long times