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Fix examples in VarQITE and VarQRTE docstrings #9860

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Mar 28, 2023
Merged

Fix examples in VarQITE and VarQRTE docstrings #9860

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20 changes: 14 additions & 6 deletions qiskit/algorithms/time_evolvers/variational/var_qite.py
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Original file line number Diff line number Diff line change
Expand Up @@ -36,11 +36,13 @@ class VarQITE(VarQTE, ImaginaryTimeEvolver):

.. code-block::python

import numpy as np

from qiskit.algorithms import TimeEvolutionProblem, VarQITE
from qiskit.algorithms.time_evolvers.variational import ImaginaryMcLachlanPrinciple
from qiskit.circuit.library import EfficientSU2
from qiskit.quantum_info import SparsePauliOp
import numpy as np
from qiskit.quantum_info import SparsePauliOp, Pauli
from qiskit.primitives import Estimator

observable = SparsePauliOp.from_list(
[
Expand All @@ -54,13 +56,19 @@ class VarQITE(VarQTE, ImaginaryTimeEvolver):
)

ansatz = EfficientSU2(observable.num_qubits, reps=1)
init_param_values = np.zeros(len(ansatz.parameters))
for i in range(len(ansatz.parameters)):
init_param_values[i] = np.pi / 2
init_param_values = np.ones(len(ansatz.parameters)) * np.pi/2
var_principle = ImaginaryMcLachlanPrinciple()
time = 1

# without evaluating auxiliary operators
evolution_problem = TimeEvolutionProblem(observable, time)
var_qite = VarQITE(ansatz, var_principle, init_param_values)
var_qite = VarQITE(ansatz, init_param_values, var_principle)
evolution_result = var_qite.evolve(evolution_problem)

# evaluating auxiliary operators
aux_ops = [Pauli("XX"), Pauli("YZ")]
evolution_problem = TimeEvolutionProblem(observable, time, aux_operators=aux_ops)
var_qite = VarQITE(ansatz, init_param_values, var_principle, Estimator())
evolution_result = var_qite.evolve(evolution_problem)
"""

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23 changes: 16 additions & 7 deletions qiskit/algorithms/time_evolvers/variational/var_qrte.py
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Original file line number Diff line number Diff line change
Expand Up @@ -36,11 +36,14 @@ class VarQRTE(VarQTE, RealTimeEvolver):

.. code-block::python

from qiskit.algorithms import TimeEvolutionProblem, VarQITE
import numpy as np

from qiskit.algorithms import TimeEvolutionProblem, VarQRTE
from qiskit.circuit.library import EfficientSU2
from qiskit.algorithms.time_evolvers.variational import RealMcLachlanPrinciple
from qiskit.quantum_info import SparsePauliOp
import numpy as np
from qiskit.quantum_info import SparsePauliOp, Pauli
from qiskit.primitives import Estimator

observable = SparsePauliOp.from_list(
[
Expand All @@ -54,14 +57,20 @@ class VarQRTE(VarQTE, RealTimeEvolver):
)

ansatz = EfficientSU2(observable.num_qubits, reps=1)
init_param_values = np.zeros(len(ansatz.parameters))
for i in range(len(ansatz.parameters)):
init_param_values[i] = np.pi / 2
init_param_values = np.ones(len(ansatz.parameters)) * np.pi/2
var_principle = RealMcLachlanPrinciple()
time = 1

# without evaluating auxiliary operators
evolution_problem = TimeEvolutionProblem(observable, time)
var_qrte = VarQRTE(ansatz, var_principle, init_param_values)
evolution_result = var_qite.evolve(evolution_problem)
var_qrte = VarQRTE(ansatz, init_param_values, var_principle)
evolution_result = var_qrte.evolve(evolution_problem)

# evaluating auxiliary operators
aux_ops = [Pauli("XX"), Pauli("YZ")]
evolution_problem = TimeEvolutionProblem(observable, time, aux_operators=aux_ops)
var_qrte = VarQRTE(ansatz, init_param_values, var_principle, Estimator())
evolution_result = var_qrte.evolve(evolution_problem)
"""

def __init__(
Expand Down