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| # -*- coding: utf-8 -*- | ||
| # Copyright 2021 ProjectQ-Framework (www.projectq.ch) | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
| # pylint: skip-file | ||
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| """Example of using the UnitarySimulator.""" | ||
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| import numpy as np | ||
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| from projectq.backends import UnitarySimulator | ||
| from projectq.cengines import MainEngine | ||
| from projectq.meta import Control | ||
| from projectq.ops import All, X, QFT, Measure, CtrlAll | ||
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| def run_circuit(eng, n_qubits, circuit_num, gate_after_measure=False): | ||
| """Run a quantum circuit demonstrating the capabilities of the UnitarySimulator.""" | ||
| qureg = eng.allocate_qureg(n_qubits) | ||
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| if circuit_num == 1: | ||
| All(X) | qureg | ||
| elif circuit_num == 2: | ||
| X | qureg[0] | ||
| with Control(eng, qureg[:2]): | ||
| All(X) | qureg[2:] | ||
| elif circuit_num == 3: | ||
| with Control(eng, qureg[:2], ctrl_state=CtrlAll.Zero): | ||
| All(X) | qureg[2:] | ||
| elif circuit_num == 4: | ||
| QFT | qureg | ||
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| eng.flush() | ||
| All(Measure) | qureg | ||
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| if gate_after_measure: | ||
| QFT | qureg | ||
| eng.flush() | ||
| All(Measure) | qureg | ||
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| def main(): | ||
| """Definition of the main function of this example.""" | ||
| # Create a MainEngine with a unitary simulator backend | ||
| eng = MainEngine(backend=UnitarySimulator()) | ||
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| n_qubits = 3 | ||
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| # Run out quantum circuit | ||
| # 1 - circuit applying X on all qubits | ||
| # 2 - circuit applying an X gate followed by a controlled-X gate | ||
| # 3 - circuit applying a off-controlled-X gate | ||
| # 4 - circuit applying a QFT on all qubits (QFT will get decomposed) | ||
| run_circuit(eng, n_qubits, 3, gate_after_measure=True) | ||
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| # Output the unitary transformation of the circuit | ||
| print('The unitary of the circuit is:') | ||
| print(eng.backend.unitary) | ||
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| # Output the final state of the qubits (assuming they all start in state |0>) | ||
| print('The final state of the qubits is:') | ||
| print(eng.backend.unitary @ np.array([1] + ([0] * (2 ** n_qubits - 1)))) | ||
| print('\n') | ||
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| # Show the unitaries separated by measurement: | ||
| for history in eng.backend.history: | ||
| print('Previous unitary is: \n', history, '\n') | ||
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| if __name__ == '__main__': | ||
| main() |
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