TeNPy Forum

Sorry, Finally, I check the fidelity of TFI with same parameters of the paper https://arxiv.org/abs/0811.3127. your overlap function is correct.

I think there are two good paper to do correct overlap(fidelity), first one is MPS fidelity(sec 2.1): https://arxiv.org/abs/cond-mat/0701428v3, the other one is traditional DMRG(In the appendex of this paper, I think it is correct, not only inifinite DMRG but finite DMRG) https://arxiv.org/abs/0804....