Hi, I am using ITENSOR julia version which works well!
I want to find expectation value of the following operator given by
e^{i \frac{\pi}{2}\sum_j (1-2n_j)}
where j ranges from 1 to L (number of sites). and n_j is fermionic number operators Further I would also like to find expectation value of the operator
n_1e^{i \frac{\pi}{2}\sum_j (1-2n_j)}n_5
where n_1 and n_5 are fermionic number operators at site 1 and 5. I tried lot of methods using Opsum(), however I am unable to compute the value.
Looking for your kind guidance.