qrunch.quantum.algorithms.second_quantization.quantum_selected_configuration_interaction.identity_subspace_generator

Subspace state generator yielding the reference state itself, for quantum-selected configuration interaction.

Classes

IdentitySubspaceStateGenerator

Identity subspace state generator for quantum-selected configuration interaction.

class IdentitySubspaceStateGenerator

Bases: SubspaceStateGenerator

Identity subspace state generator for quantum-selected configuration interaction.

This generator simply yields the reference state, whose circuit is assumed to prepare a useful state (e.g. a Hartree-Fock state or a VQE-optimized ansatz).

Note that QuantumSelectedConfigurationInteraction already samples the reference circuit for its determinants, so the state yielded here is sampled a second time; this is harmless and keeps the generator the correct way to run plain (reference-only) QSCI, including the VQE-seeded path.

__init__(*args, **kwargs)

generate() → Iterator[SubspaceState]

Yield the single state whose samples define the diagonalization subspace.

Return type:

Iterator[SubspaceState]