Finite MPS and MPO methods based on the Julia version of ITensor (ITensors.jl). See the ITensors.jl documentation for more details.
All MPS/MPO code from ITensors.jl and ITensorTDVP.jl has been moved into this repository and this repository now relies on ITensors.jl v0.7 and above. All of the MPS/MPO functionality that was previously in ITensors.jl and ITensorTDVP.jl will be developed here from now on. For users of this repository, this change should not break any code, though please let us know if you have any issues.
If you are using any MPS/MPO functionality of ITensors.jl, such as the MPS and MPO types or constructors thereof (like random_mps), OpSum, siteinds, dmrg, apply, etc. you should install the ITensorMPS.jl package with import Pkg; Pkg.add("ITensorMPS") and add using ITensorMPS to your code. Additionally, if you are currently using ITensorTDVP.jl, you should replace using ITensorTDVP with using ITensorMPS in your code.
This release introduces a new (experimental) function expand for performing global Krylov expansion based on arXiv:2005.06104. It is a re-export of the expand function introduced in ITensorTDVP.jl v0.4.1, see the ITensorTDVP.jl v0.4.1 release notes for more details.
ITensorMPS.jl v0.2 has been released, which is a breaking release. It updates to using ITensorTDVP.jl v0.4, which has a number of breaking changes to the tdvp, linsolve, and dmrg_x functions. See the ITensorTDVP.jl v0.4 release notes for details.