Quantum-computing bridge for OpenQP.
Export an OpenQP mean-field calculation as a second-quantized molecular
Hamiltonian / FCIDUMP, ready for quantum-computing electronic-structure
toolkits (Qiskit Nature, OpenFermion, Block2, ...).
Typical use::
from oqp.quantum import from_openqp
ham = from_openqp(mol, eri_ao=eri) # eri = AO two-electron integrals
ham.to_fcidump("molecule.FCIDUMP")
The integral-transform and FCIDUMP I/O helpers
(:mod:`oqp.quantum.integrals`, :mod:`oqp.quantum.fcidump`) have no dependency
on the compiled ``oqp`` extension and can be used stand-alone.