woodsp-ibm
commented
6 months ago There was an earlier FermionicOp in qiskit_nature.operators that took a register length. These were all deprecated and removed - the version that now exists takes num_spin_orbitals https://qiskit-community.github.io/qiskit-nature/stubs/qiskit_nature.second_q.operators.FermionicOp.html You can see an instance created in this tutorial https://qiskit-community.github.io/qiskit-nature/tutorials/12_deuteron_binding_energy.html
Environment
What is happening?
In the below code, I am getting an error like TypeError: FermionicOp.init() got an unexpected keyword argument 'register_length'.
Why is not taking in register_length?What corrections should I make to the code?
How can we reproduce the issue?
''' N_sites = 5 hopping_terms = []
for ii in range (N_sites - 1): hopping_terms.append(sum(FermionicOp(label,register_length = Nsites) for label in ["+%i -%i" % (ii, ii+1), "+%i -_%i" % (ii+1, ii)])) '''
What should happen?
The code should create the fermionic operators for a given system of linear lattice with 5 sites. But, it is showing error in accepting the register_length keyword.
Any suggestions?
No response