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=========================================================== Matrix Product Operators (MPO) for two-body Hamiltonians =========================================================== The function to use is directHmpo in mpo_direct.py, where an example can be also found. It allows to construct MPO for two-body H for any grouping of orbitals (specified by partition of spin orbitals), e.g., 365 k = 10 366 h1e,h2e = genRandomH(k) 367 partition = [[0,1,2,3],[4,5],[6,7],[8,9]] 368 ngroups,wfacs = directHmpo(h1e,h2e,partition,isym=0) 369 print ngroups 370 for i in range(ngroups): 371 print wfacs[i].shape The output is a list of W[k] for MPO. Formula can be found in doc/formula.pdf using defintions in Appendix of the paper: J. Chem. Phys. 145, 014102 (2016); doi: 10.1063/1.4955108 View online: http://dx.doi.org/10.1063/1.4955108
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