Block2: MPO Implementation of Ab Initio DMRG
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**Package:** https://github.com/block-hczhai/block2-preview

Block2 implements the ab initio DMRG algorithm in MPO and MPS language, with a more flexible code structure. Some important additional features are:

1. Finite-Temperature ab inito DMRG
   
2. One particle Green's function
   
3. Five-Level parallelism

 

**Reference:** Huanchen Zhai and Garnet Kin-Lic Chan. "Low communication high performance ab initio density matrix renormalization group algorithms." arXiv preprint `arXiv:2103.09976 <https://arxiv.org/abs/2103.09976>`_ (2021).