Source code for qlauncher.routines.qiskit.algorithms.grover

 1from qlauncher.base import Algorithm, Result
 2from qlauncher.base.models import GroverCircuit
 3from qlauncher.routines.qiskit.backends.qiskit_backend import QiskitBackend
 4
 5from qiskit.circuit.library import grover_operator
 6from qiskit import QuantumCircuit
 7
 8

[docs]
 9class Grover(Algorithm[GroverCircuit, QiskitBackend]):
10    def __init__(self, n_shots: int, **alg_kwargs):
11        super().__init__(**alg_kwargs)
12        self.n_shots = n_shots
13

[docs]
14    def run(self, problem: GroverCircuit, backend: QiskitBackend) -> Result:
15        grover_op = grover_operator(problem.oracle, problem.state_prep)
16        full_circuit = QuantumCircuit(problem.oracle.num_qubits)
17
18        full_circuit.append(problem.state_prep, range(problem.state_prep.num_qubits))
19
20        for _ in range(problem.num_iterations):
21            full_circuit.compose(grover_op, inplace=True)
22        full_circuit.measure_all()
23
24        self._circuit = full_circuit
25
26        job = backend.sampler.run([full_circuit], shots=self.n_shots)
27
28        return job.result()[0]

29

[docs]
30    def circuit(self, mode: str = '') -> QuantumCircuit | None:
31        if not self._circuit:
32            print('Run the algorithm to generate circuit')
33        else:
34            return self._circuit