Grover_Algo

#Grover Algorithm using QuantumCircuit as Oracle


from qiskit import QuantumCircuit
from qiskit.algorithms import AmplificationProblem

# the state we desire to find is '11'
good_state = ['11']

# specify the oracle that marks the state '11' as a good solution
oracle = QuantumCircuit(2)
oracle.cz(0, 1)

# define Grover's algorithm
problem = AmplificationProblem(oracle, is_good_state=good_state)

# now we can have a look at the Grover operator that is used in running the algorithm
problem.grover_operator.draw(output='mpl')

from qiskit import Aer
from qiskit.utils import QuantumInstance
from qiskit.algorithms import Grover

aer_simulator = Aer.get_backend('aer_simulator')
grover = Grover(quantum_instance=aer_simulator)
result = grover.amplify(problem)
print('Result type:', type(result))
print()
print('Success!' if result.oracle_evaluation else 'Failure!')
print('Top measurement:', result.top_measurement)