MPO representation in tensorcircuit

[gaox-qd]

Hi all, excellent work!
The construction of MPO representation for a general Hamiltonian should be very interesting, is it possible to get the MPO currently for a Hamiltonian besides FiniteTFI as shown in the example?

[refraction-ray]

Good question. Currently, we have utility function in tensorcircuit as tc.quantum.quimb2qop and tc.quantum.tn2qop which support MPO transformation from quimb package and tensornetwork package. For quimb package, you can build general spin Hamiltonian with NN interaction, see https://github.com/jcmgray/quimb/blob/develop/quimb/tensor/tensor_gen.py#L2236. And for the utility transformation function usage, you can check test cases in https://github.com/tencent-quantum-lab/tensorcircuit/blob/master/tests/test_quantum.py#L364-L409.