def interpret(self, result: EigenstateResult) -> None:
"""Interprets an :class:`~qiskit_nature.results.EigenstateResult` in this property's context.
Args:
result: the result to add meaning to.
"""
result.hartree_fock_energy = self._reference_energy
result.nuclear_repulsion_energy = self._nuclear_repulsion_energy
result.extracted_transformer_energies = self._shift.copy()
def interpret(self, result: EigenstateResult) -> None:
"""Interprets an :class:`~qiskit_nature.results.EigenstateResult` in this property's context.
Args:
result: the result to add meaning to.
"""
result.nuclear_dipole_moment = self._nuclear_dipole_moment
result.reverse_dipole_sign = self._reverse_dipole_sign
result.computed_dipole_moment = []
result.extracted_transformer_dipoles = []
if not isinstance(result.aux_operator_eigenvalues, list):
aux_operator_eigenvalues = [result.aux_operator_eigenvalues]
else:
aux_operator_eigenvalues = result.aux_operator_eigenvalues
for aux_op_eigenvalues in aux_operator_eigenvalues:
if aux_op_eigenvalues is None:
continue
if isinstance(aux_op_eigenvalues,
list) and len(aux_op_eigenvalues) < 6:
continue
axes_order = {"x": 0, "y": 1, "z": 2}
dipole_moment = [None] * 3
for prop in iter(self):
moment: Optional[tuple[complex, complex]]
try:
moment = aux_op_eigenvalues[axes_order[prop._axis] + 3]
except KeyError:
moment = aux_op_eigenvalues.get(prop.name, None)
if moment is not None:
dipole_moment[axes_order[
prop._axis]] = moment[0].real # type: ignore
result.computed_dipole_moment.append(
cast(DipoleTuple, tuple(dipole_moment)))
dipole_shifts: dict[str, dict[str, complex]] = {}
for prop in self._properties.values():
for name, shift in prop._shift.items():
if name not in dipole_shifts:
dipole_shifts[name] = {}
dipole_shifts[name][prop._axis] = shift
result.extracted_transformer_dipoles.append({
name: cast(DipoleTuple, (shift["x"], shift["y"], shift["z"]))
for name, shift in dipole_shifts.items()
})
def interpret(self, result: EigenstateResult) -> None:
"""Interprets an :class:`~qiskit_nature.results.EigenstateResult` in this property's context.
Args:
result: the result to add meaning to.
"""
result.num_occupied_modals_per_mode = []
if not isinstance(result.aux_operator_eigenvalues, list):
aux_operator_eigenvalues = [result.aux_operator_eigenvalues]
else:
aux_operator_eigenvalues = result.aux_operator_eigenvalues
num_modes = len(self._basis._num_modals_per_mode)
for aux_op_eigenvalues in aux_operator_eigenvalues:
occ_modals = []
for mode in range(num_modes):
_key = str(mode) if isinstance(aux_op_eigenvalues,
dict) else mode
if aux_op_eigenvalues[_key] is not None:
occ_modals.append(aux_op_eigenvalues[_key][0].real)
else:
occ_modals.append(None)
result.num_occupied_modals_per_mode.append(occ_modals)
def test_interpret(self):
"""Tests that the result is interpreted"""
num_nodes = 4
boundary_condition = BoundaryCondition.OPEN
line_lattice = LineLattice(num_nodes=num_nodes,
boundary_condition=boundary_condition)
fhm = FermiHubbardModel(lattice=line_lattice, onsite_interaction=5.0)
eigenenergies = np.array([-1])
eigenstates = [np.array([1, 0])]
aux_operator_eigenvalues = [(1, 2)]
# For EigenstateResult
lmp = LatticeModelProblem(fhm)
eigenstate_result = EigenstateResult()
eigenstate_result.eigenenergies = eigenenergies
eigenstate_result.eigenstates = eigenstates
eigenstate_result.aux_operator_eigenvalues = aux_operator_eigenvalues
lmr = lmp.interpret(eigenstate_result)
self.assertEqual(lmr.eigenenergies, eigenstate_result.eigenenergies)
self.assertEqual(lmr.eigenstates, eigenstate_result.eigenstates)
self.assertEqual(lmr.aux_operator_eigenvalues,
eigenstate_result.aux_operator_eigenvalues)
# For EigenSOlverResult
lmp = LatticeModelProblem(fhm)
eigensolver_result = EigensolverResult()
eigensolver_result.eigenvalues = eigenenergies
eigensolver_result.eigenstates = eigenstates
eigensolver_result.aux_operator_eigenvalues = [
aux_operator_eigenvalues
]
lmr = lmp.interpret(eigensolver_result)
self.assertEqual(lmr.eigenenergies, eigensolver_result.eigenvalues)
self.assertEqual(lmr.eigenstates, eigensolver_result.eigenstates)
self.assertEqual(lmr.aux_operator_eigenvalues,
eigensolver_result.aux_operator_eigenvalues)
# For MinimumEigensolverResult
lmp = LatticeModelProblem(fhm)
mes_result = MinimumEigensolverResult()
mes_result.eigenvalue = -1
mes_result.eigenstate = np.array([1, 0])
mes_result.aux_operator_eigenvalues = aux_operator_eigenvalues
lmr = lmp.interpret(mes_result)
self.assertEqual(lmr.eigenenergies,
np.asarray([mes_result.eigenvalue]))
self.assertEqual(lmr.eigenstates, [mes_result.eigenstate])
self.assertEqual(lmr.aux_operator_eigenvalues,
[mes_result.aux_operator_eigenvalues])
def solve(
self,
problem: BaseProblem,
aux_operators: Optional[List[Union[SecondQuantizedOp,
PauliSumOp]]] = None,
) -> EigenstateResult:
"""Compute Ground and Excited States properties.
Args:
problem: a class encoding a problem to be solved.
aux_operators: Additional auxiliary operators to evaluate.
Raises:
NotImplementedError: If an operator in ``aux_operators`` is not of type
``FermionicOperator``.
Returns:
An interpreted :class:`~.EigenstateResult`. For more information see also
:meth:`~.BaseProblem.interpret`.
"""
# get the operator and auxiliary operators, and transform the provided auxiliary operators
# note that ``aux_operators`` contains not only the transformed ``aux_operators`` passed
# by the user but also additional ones from the transformation
second_q_ops = problem.second_q_ops()
main_operator = self._qubit_converter.convert(
second_q_ops[0],
num_particles=problem.num_particles,
sector_locator=problem.symmetry_sector_locator,
)
aux_ops = self._qubit_converter.convert_match(second_q_ops[1:])
if aux_operators is not None:
for aux_op in aux_operators:
if isinstance(aux_op, SecondQuantizedOp):
aux_ops.append(
self._qubit_converter.convert_match(aux_op, True))
else:
aux_ops.append(aux_op)
if isinstance(self._solver, EigensolverFactory):
# this must be called after transformation.transform
solver = self._solver.get_solver(problem)
else:
solver = self._solver
# if the eigensolver does not support auxiliary operators, reset them
if not solver.supports_aux_operators():
aux_ops = None
raw_es_result = solver.compute_eigenvalues(main_operator, aux_ops)
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_es_result
eigenstate_result.eigenenergies = raw_es_result.eigenvalues
eigenstate_result.eigenstates = raw_es_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = raw_es_result.aux_operator_eigenvalues
result = problem.interpret(eigenstate_result)
return result
def solve(
self,
driver: BaseDriver,
aux_operators: Optional[List[Any]] = None
) -> Union[ElectronicStructureResult, VibronicStructureResult]:
"""Compute Ground and Excited States properties.
Args:
driver: a chemistry driver object which defines the chemical problem that is to be
solved by this calculation.
aux_operators: Additional auxiliary operators to evaluate. Must be of type
``FermionicOperator`` if the qubit transformation is fermionic and of type
``BosonicOperator`` it is bosonic.
Raises:
NotImplementedError: If an operator in ``aux_operators`` is not of type
``FermionicOperator``.
Returns:
An eigenstate result. Depending on the transformation this can be an electronic
structure or bosonic result.
"""
if aux_operators is not None:
if any(not isinstance(op, (PauliSumOp, FermionicOperator))
for op in aux_operators):
raise NotImplementedError(
'Currently only fermionic problems are supported.')
# get the operator and auxiliary operators, and transform the provided auxiliary operators
# note that ``aux_operators`` contains not only the transformed ``aux_operators`` passed
# by the user but also additional ones from the transformation
operator, aux_operators = self.transformation.transform(
driver, aux_operators)
if isinstance(self._solver, EigensolverFactory):
# this must be called after transformation.transform
solver = self._solver.get_solver(self.transformation)
else:
solver = self._solver
# if the eigensolver does not support auxiliary operators, reset them
if not solver.supports_aux_operators():
aux_operators = None
raw_es_result = solver.compute_eigenvalues(operator, aux_operators)
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_es_result
eigenstate_result.eigenenergies = raw_es_result.eigenvalues
eigenstate_result.eigenstates = raw_es_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = raw_es_result.aux_operator_eigenvalues
result = self.transformation.interpret(eigenstate_result)
return result
def interpret(self, result: EigenstateResult) -> None:
"""Interprets an :class:`~qiskit_nature.results.EigenstateResult` in this property's context.
Args:
result: the result to add meaning to.
"""
result.magnetization = []
if not isinstance(result.aux_operator_eigenvalues, list):
aux_operator_eigenvalues = [result.aux_operator_eigenvalues]
else:
aux_operator_eigenvalues = result.aux_operator_eigenvalues
for aux_op_eigenvalues in aux_operator_eigenvalues:
if aux_op_eigenvalues is None:
continue
_key = self.name if isinstance(aux_op_eigenvalues, dict) else 2
if aux_op_eigenvalues[_key] is not None:
result.magnetization.append(aux_op_eigenvalues[_key][0].real)
else:
result.magnetization.append(None)
def interpret(self, result: EigenstateResult) -> None:
"""Interprets an :class:`~qiskit_nature.results.EigenstateResult` in this property's context.
Args:
result: the result to add meaning to.
"""
expected = self.spin
result.total_angular_momentum = []
if not isinstance(result.aux_operator_eigenvalues, list):
aux_operator_eigenvalues = [result.aux_operator_eigenvalues]
else:
aux_operator_eigenvalues = result.aux_operator_eigenvalues
for aux_op_eigenvalues in aux_operator_eigenvalues:
if aux_op_eigenvalues is None:
continue
_key = self.name if isinstance(aux_op_eigenvalues, dict) else 1
if aux_op_eigenvalues[_key] is not None:
total_angular_momentum = aux_op_eigenvalues[_key][0].real
result.total_angular_momentum.append(total_angular_momentum)
if expected is not None:
spin = (-1.0 + np.sqrt(1 + 4 * total_angular_momentum)) / 2
if not np.isclose(
spin,
expected,
rtol=self._relative_tolerance,
atol=self._absolute_tolerance,
):
LOGGER.info(
"The measured spin %s does NOT match the expected spin %s!",
spin,
expected,
)
else:
result.total_angular_momentum.append(None)
def interpret(self, result: EigenstateResult) -> None:
"""Interprets an :class:`~qiskit_nature.results.EigenstateResult` in this property's context.
Args:
result: the result to add meaning to.
"""
expected = self.num_alpha + self.num_beta
result.num_particles = []
if not isinstance(result.aux_operator_eigenvalues, list):
aux_operator_eigenvalues = [result.aux_operator_eigenvalues]
else:
aux_operator_eigenvalues = result.aux_operator_eigenvalues
for aux_op_eigenvalues in aux_operator_eigenvalues:
if aux_op_eigenvalues is None:
continue
_key = self.name if isinstance(aux_op_eigenvalues, dict) else 0
if aux_op_eigenvalues[_key] is not None:
n_particles = aux_op_eigenvalues[_key][0].real
result.num_particles.append(n_particles)
if not np.isclose(
n_particles,
expected,
rtol=self._relative_tolerance,
atol=self._absolute_tolerance,
):
LOGGER.info(
"The measured number of particles %s does NOT match the expected number of "
"particles %s!",
n_particles,
expected,
)
else:
result.num_particles.append(None)
def solve(
self,
problem: BaseProblem,
aux_operators: Optional[ListOrDictType[Union[SecondQuantizedOp, PauliSumOp]]] = None,
) -> EigenstateResult:
"""Compute Ground and Excited States properties.
Args:
problem: a class encoding a problem to be solved.
aux_operators: Additional auxiliary operators to evaluate.
Raises:
ValueError: if the grouped property object returned by the driver does not contain a
main property as requested by the problem being solved (`problem.main_property_name`)
QiskitNatureError: if the user-provided `aux_operators` contain a name which clashes
with an internally constructed auxiliary operator. Note: the names used for the
internal auxiliary operators correspond to the `Property.name` attributes which
generated the respective operators.
Returns:
An interpreted :class:`~.EigenstateResult`. For more information see also
:meth:`~.BaseProblem.interpret`.
"""
# get the operator and auxiliary operators, and transform the provided auxiliary operators
# note that ``aux_operators`` contains not only the transformed ``aux_operators`` passed
# by the user but also additional ones from the transformation
main_operator, aux_ops = self.get_qubit_operators(problem, aux_operators)
raw_es_result = self._solver.compute_eigenvalues(main_operator, aux_ops) # type: ignore
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_es_result
eigenstate_result.eigenenergies = raw_es_result.eigenvalues
eigenstate_result.eigenstates = raw_es_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = raw_es_result.aux_operator_eigenvalues
result = problem.interpret(eigenstate_result)
return result
def solve(
self,
driver: BaseDriver,
aux_operators: Optional[Union[List[FermionicOperator],
List[BosonicOperator]]] = None
) -> Union[ElectronicStructureResult, VibronicStructureResult]:
"""Run the excited-states calculation.
Construct and solves the EOM pseudo-eigenvalue problem to obtain the excitation energies
and the excitation operators expansion coefficients.
Args:
driver: a chemistry driver object which defines the chemical problem that is to be
solved by this calculation.
aux_operators: Additional auxiliary operators to evaluate. Must be of type
``FermionicOperator`` if the qubit transformation is fermionic and of type
``BosonicOperator`` it is bosonic.
Returns:
The excited states result. In case of a fermionic problem a
``ElectronicStructureResult`` is returned and in the bosonic case a
``VibronicStructureResult``.
"""
if aux_operators is not None:
logger.warning(
"With qEOM the auxiliary operators can currently only be "
"evaluated on the ground state.")
# 1. Run ground state calculation
groundstate_result = self._gsc.solve(driver, aux_operators)
# 2. Prepare the excitation operators
matrix_operators_dict, size = self._prepare_matrix_operators()
# 3. Evaluate eom operators
measurement_results = self._gsc.evaluate_operators(
groundstate_result.raw_result['eigenstate'], matrix_operators_dict)
measurement_results = cast(Dict[str, List[float]], measurement_results)
# 4. Post-process ground_state_result to construct eom matrices
m_mat, v_mat, q_mat, w_mat, m_mat_std, v_mat_std, q_mat_std, w_mat_std = \
self._build_eom_matrices(measurement_results, size)
# 5. solve pseudo-eigenvalue problem
energy_gaps, expansion_coefs = self._compute_excitation_energies(
m_mat, v_mat, q_mat, w_mat)
qeom_result = QEOMResult()
qeom_result.ground_state_raw_result = groundstate_result.raw_result
qeom_result.expansion_coefficients = expansion_coefs
qeom_result.excitation_energies = energy_gaps
qeom_result.m_matrix = m_mat
qeom_result.v_matrix = v_mat
qeom_result.q_matrix = q_mat
qeom_result.w_matrix = w_mat
qeom_result.m_matrix_std = m_mat_std
qeom_result.v_matrix_std = v_mat_std
qeom_result.q_matrix_std = q_mat_std
qeom_result.w_matrix_std = w_mat_std
eigenstate_result = EigenstateResult()
eigenstate_result.eigenstates = groundstate_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = groundstate_result.aux_operator_eigenvalues
eigenstate_result.raw_result = qeom_result
eigenstate_result.eigenenergies = np.append(
groundstate_result.eigenenergies,
np.asarray([
groundstate_result.eigenenergies[0] + gap
for gap in energy_gaps
]))
result = self._gsc.transformation.interpret(eigenstate_result)
return result
def test_groundenergy(self):
"""Tests ground energy"""
eigenstate_result = EigenstateResult()
eigenstate_result.eigenenergies = np.array([1, 2, 3])
self.assertEqual(eigenstate_result.groundenergy, 1)
def interpret(
self, raw_result: Union[EigenstateResult, EigensolverResult,
MinimumEigensolverResult]
) -> ElectronicStructureResult:
"""Interprets an EigenstateResult in the context of this transformation.
Args:
raw_result: an eigenstate result object.
Returns:
An electronic structure result.
"""
eigenstate_result = None
if isinstance(raw_result, EigenstateResult):
eigenstate_result = raw_result
elif isinstance(raw_result, EigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = raw_result.eigenvalues
eigenstate_result.eigenstates = raw_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = raw_result.aux_operator_eigenvalues
elif isinstance(raw_result, MinimumEigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = np.asarray(
[raw_result.eigenvalue])
eigenstate_result.eigenstates = [raw_result.eigenstate]
eigenstate_result.aux_operator_eigenvalues = [
raw_result.aux_operator_eigenvalues
]
result = ElectronicStructureResult()
result.combine(eigenstate_result)
result.computed_energies = np.asarray(
[e.real for e in eigenstate_result.eigenenergies])
result.hartree_fock_energy = self._hf_energy
result.nuclear_repulsion_energy = self._nuclear_repulsion_energy
if self._nuclear_dipole_moment is not None:
result.nuclear_dipole_moment = tuple(
x for x in self._nuclear_dipole_moment)
result.ph_extracted_energy = self._ph_energy_shift
result.frozen_extracted_energy = self._energy_shift
if result.aux_operator_eigenvalues is not None:
# the first three values are hardcoded to number of particles, angular momentum
# and magnetization in this order
result.num_particles = []
result.total_angular_momentum = []
result.magnetization = []
result.computed_dipole_moment = []
result.ph_extracted_dipole_moment = []
result.frozen_extracted_dipole_moment = []
if not isinstance(result.aux_operator_eigenvalues, list):
aux_operator_eigenvalues = [result.aux_operator_eigenvalues]
else:
aux_operator_eigenvalues = result.aux_operator_eigenvalues # type: ignore
for aux_op_eigenvalues in aux_operator_eigenvalues:
if aux_op_eigenvalues is None:
continue
if aux_op_eigenvalues[0] is not None:
result.num_particles.append(
aux_op_eigenvalues[0][0].real) # type: ignore
if aux_op_eigenvalues[1] is not None:
result.total_angular_momentum.append(
aux_op_eigenvalues[1][0].real) # type: ignore
if aux_op_eigenvalues[2] is not None:
result.magnetization.append(
aux_op_eigenvalues[2][0].real) # type: ignore
# the next three are hardcoded to Dipole moments, if they are set
if len(aux_op_eigenvalues) >= 6 and self._has_dipole_moments:
# check if the names match
# extract dipole moment in each axis
dipole_moment = []
for moment in aux_op_eigenvalues[3:6]:
if moment is not None:
dipole_moment += [moment[0].real] # type: ignore
else:
dipole_moment += [None]
result.reverse_dipole_sign = self._reverse_dipole_sign
result.computed_dipole_moment.append(
cast(DipoleTuple, tuple(dipole_moment)))
result.ph_extracted_dipole_moment.append(
(self._ph_x_dipole_shift, self._ph_y_dipole_shift,
self._ph_z_dipole_shift))
result.frozen_extracted_dipole_moment.append(
(self._x_dipole_shift, self._y_dipole_shift,
self._z_dipole_shift))
return result
def interpret(
self,
raw_result: Union[EigenstateResult, EigensolverResult,
MinimumEigensolverResult],
) -> ElectronicStructureResult:
"""Interprets an EigenstateResult in the context of this transformation.
Args:
raw_result: an eigenstate result object.
Returns:
An electronic structure result.
"""
eigenstate_result = None
if isinstance(raw_result, EigenstateResult):
eigenstate_result = raw_result
elif isinstance(raw_result, EigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = raw_result.eigenvalues
eigenstate_result.eigenstates = raw_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = raw_result.aux_operator_eigenvalues
elif isinstance(raw_result, MinimumEigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = np.asarray(
[raw_result.eigenvalue])
eigenstate_result.eigenstates = [raw_result.eigenstate]
eigenstate_result.aux_operator_eigenvalues = [
raw_result.aux_operator_eigenvalues
]
result = ElectronicStructureResult()
result.combine(eigenstate_result)
self._grouped_property_transformed.interpret(result)
result.computed_energies = np.asarray(
[e.real for e in eigenstate_result.eigenenergies])
return result
def interpret(
self, raw_result: Union[EigenstateResult, EigensolverResult,
MinimumEigensolverResult]
) -> VibronicStructureResult:
"""Interprets an EigenstateResult in the context of this transformation.
Args:
raw_result: an eigenstate result object.
Returns:
An vibronic structure result.
"""
eigenstate_result = None
if isinstance(raw_result, EigenstateResult):
eigenstate_result = raw_result
elif isinstance(raw_result, EigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = raw_result.eigenvalues
eigenstate_result.eigenstates = raw_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = raw_result.aux_operator_eigenvalues
elif isinstance(raw_result, MinimumEigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = np.asarray(
[raw_result.eigenvalue])
eigenstate_result.eigenstates = [raw_result.eigenstate]
eigenstate_result.aux_operator_eigenvalues = raw_result.aux_operator_eigenvalues
result = VibronicStructureResult()
result.combine(eigenstate_result)
result.computed_vibronic_energies = eigenstate_result.eigenenergies
if result.aux_operator_eigenvalues is not None:
if not isinstance(result.aux_operator_eigenvalues, list):
aux_operator_eigenvalues = [result.aux_operator_eigenvalues]
else:
aux_operator_eigenvalues = result.aux_operator_eigenvalues # type: ignore
result.num_occupied_modals_per_mode = []
for aux_op_eigenvalues in aux_operator_eigenvalues:
occ_modals = []
for mode in range(self._num_modes):
if aux_op_eigenvalues[mode] is not None:
occ_modals.append(
aux_op_eigenvalues[mode][0].real) # type: ignore
else:
occ_modals.append(None)
result.num_occupied_modals_per_mode.append(
occ_modals) # type: ignore
return result
def solve(
self,
problem: BaseProblem,
aux_operators: Optional[List[SecondQuantizedOp]] = None
) -> EigenstateResult:
"""Run the excited-states calculation.
Construct and solves the EOM pseudo-eigenvalue problem to obtain the excitation energies
and the excitation operators expansion coefficients.
Args:
problem: a class encoding a problem to be solved.
aux_operators: Additional auxiliary operators to evaluate.
Returns:
An interpreted :class:`~.EigenstateResult`. For more information see also
:meth:`~.BaseProblem.interpret`.
"""
if aux_operators is not None:
logger.warning(
"With qEOM the auxiliary operators can currently only be "
"evaluated on the ground state.")
# 1. Run ground state calculation
groundstate_result = self._gsc.solve(problem)
# 2. Prepare the excitation operators
self._untapered_qubit_op_main = self._gsc._qubit_converter.map(
problem.second_q_ops()[0])
matrix_operators_dict, size = self._prepare_matrix_operators(problem)
# 3. Evaluate eom operators
measurement_results = self._gsc.evaluate_operators(
groundstate_result.eigenstates[0], matrix_operators_dict)
measurement_results = cast(Dict[str, List[float]], measurement_results)
# 4. Post-process ground_state_result to construct eom matrices
m_mat, v_mat, q_mat, w_mat, m_mat_std, v_mat_std, q_mat_std, w_mat_std = \
self._build_eom_matrices(measurement_results, size)
# 5. solve pseudo-eigenvalue problem
energy_gaps, expansion_coefs = self._compute_excitation_energies(
m_mat, v_mat, q_mat, w_mat)
qeom_result = QEOMResult()
qeom_result.ground_state_raw_result = groundstate_result.raw_result
qeom_result.expansion_coefficients = expansion_coefs
qeom_result.excitation_energies = energy_gaps
qeom_result.m_matrix = m_mat
qeom_result.v_matrix = v_mat
qeom_result.q_matrix = q_mat
qeom_result.w_matrix = w_mat
qeom_result.m_matrix_std = m_mat_std
qeom_result.v_matrix_std = v_mat_std
qeom_result.q_matrix_std = q_mat_std
qeom_result.w_matrix_std = w_mat_std
eigenstate_result = EigenstateResult()
eigenstate_result.eigenstates = groundstate_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = groundstate_result.aux_operator_eigenvalues
eigenstate_result.raw_result = qeom_result
eigenstate_result.eigenenergies = np.append(
groundstate_result.eigenenergies,
np.asarray([
groundstate_result.eigenenergies[0] + gap
for gap in energy_gaps
]))
result = problem.interpret(eigenstate_result)
return result
def interpret(
self,
raw_result: Union[EigenstateResult, EigensolverResult,
MinimumEigensolverResult],
) -> LatticeModelResult:
"""Interprets a raw result in the context of this transformation.
Args:
raw_result: a raw result to be interpreted
Returns:
A lattice model result.
"""
eigenstate_result = None
if isinstance(raw_result, EigenstateResult):
eigenstate_result = raw_result
elif isinstance(raw_result, EigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = raw_result.eigenvalues
eigenstate_result.eigenstates = raw_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = raw_result.aux_operator_eigenvalues
elif isinstance(raw_result, MinimumEigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = np.asarray(
[raw_result.eigenvalue])
eigenstate_result.eigenstates = [raw_result.eigenstate]
eigenstate_result.aux_operator_eigenvalues = [
raw_result.aux_operator_eigenvalues
]
result = LatticeModelResult()
result.combine(eigenstate_result)
result.computed_lattice_energies = eigenstate_result.eigenenergies
return result
def solve(
self,
problem: BaseProblem,
aux_operators: Optional[ListOrDictType[Union[SecondQuantizedOp,
PauliSumOp]]] = None,
) -> EigenstateResult:
"""Compute Ground and Excited States properties.
Args:
problem: a class encoding a problem to be solved.
aux_operators: Additional auxiliary operators to evaluate.
Raises:
ValueError: if the grouped property object returned by the driver does not contain a
main property as requested by the problem being solved (`problem.main_property_name`)
QiskitNatureError: if the user-provided `aux_operators` contain a name which clashes
with an internally constructed auxiliary operator. Note: the names used for the
internal auxiliary operators correspond to the `Property.name` attributes which
generated the respective operators.
Returns:
An interpreted :class:`~.EigenstateResult`. For more information see also
:meth:`~.BaseProblem.interpret`.
"""
# get the operator and auxiliary operators, and transform the provided auxiliary operators
# note that ``aux_operators`` contains not only the transformed ``aux_operators`` passed
# by the user but also additional ones from the transformation
second_q_ops = problem.second_q_ops()
aux_second_q_ops: ListOrDictType[SecondQuantizedOp]
if isinstance(second_q_ops, list):
main_second_q_op = second_q_ops[0]
aux_second_q_ops = second_q_ops[1:]
elif isinstance(second_q_ops, dict):
name = problem.main_property_name
main_second_q_op = second_q_ops.pop(name, None)
if main_second_q_op is None:
raise ValueError(
f"The main `SecondQuantizedOp` associated with the {name} property cannot be "
"`None`.")
aux_second_q_ops = second_q_ops
main_operator = self._qubit_converter.convert(
main_second_q_op,
num_particles=problem.num_particles,
sector_locator=problem.symmetry_sector_locator,
)
aux_ops = self._qubit_converter.convert_match(aux_second_q_ops)
if aux_operators is not None:
wrapped_aux_operators: ListOrDict[Union[
SecondQuantizedOp, PauliSumOp]] = ListOrDict(aux_operators)
for name_aux, aux_op in iter(wrapped_aux_operators):
if isinstance(aux_op, SecondQuantizedOp):
converted_aux_op = self._qubit_converter.convert_match(
aux_op, True)
else:
converted_aux_op = aux_op
if isinstance(aux_ops, list):
aux_ops.append(converted_aux_op)
elif isinstance(aux_ops, dict):
if name_aux in aux_ops.keys():
raise QiskitNatureError(
f"The key '{name_aux}' is already taken by an internally constructed "
"auxiliary operator! Please use a different name for your custom "
"operator.")
aux_ops[name_aux] = converted_aux_op
if isinstance(self._solver, EigensolverFactory):
# this must be called after transformation.transform
solver = self._solver.get_solver(problem)
else:
solver = self._solver
# if the eigensolver does not support auxiliary operators, reset them
if not solver.supports_aux_operators():
aux_ops = None
raw_es_result = solver.compute_eigenvalues(main_operator, aux_ops)
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_es_result
eigenstate_result.eigenenergies = raw_es_result.eigenvalues
eigenstate_result.eigenstates = raw_es_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = raw_es_result.aux_operator_eigenvalues
result = problem.interpret(eigenstate_result)
return result
def _interpret_raw_result(raw_result):
eigenstate_result = None
if isinstance(raw_result, EigenstateResult):
eigenstate_result = raw_result
elif isinstance(raw_result, EigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = raw_result.eigenvalues
eigenstate_result.eigenstates = raw_result.eigenstates
eigenstate_result.aux_operator_eigenvalues = raw_result.aux_operator_eigenvalues
elif isinstance(raw_result, MinimumEigensolverResult):
eigenstate_result = EigenstateResult()
eigenstate_result.raw_result = raw_result
eigenstate_result.eigenenergies = np.asarray([raw_result.eigenvalue])
eigenstate_result.eigenstates = [raw_result.eigenstate]
eigenstate_result.aux_operator_eigenvalues = raw_result.aux_operator_eigenvalues
return eigenstate_result
