diff --git a/quantum/libraries/quantum_noise.py b/quantum/libraries/quantum_noise.py new file mode 100644 index 000000000..421bf3296 --- /dev/null +++ b/quantum/libraries/quantum_noise.py @@ -0,0 +1,103 @@ +# quantum_noise.py +import numpy as np +from qiskit import QuantumCircuit, Aer, execute +from qiskit.visualization import plot_histogram, plot_bloch_multivector +from qiskit.providers.aer import AerSimulator +from qiskit.providers.aer.noise import NoiseModel, depolarizing_error, amplitude_damping_error, phase_damping_error +from qiskit.quantum_info import Statevector + +def create_noise_model(noise_type='depolarizing', noise_level=0.1): + """ + Create a noise model based on the specified type and level. + + Parameters: + - noise_type: Type of noise ('depolarizing', 'amplitude_damping', 'phase_damping') + - noise_level: Level of noise (0 to 1) + + Returns: + - NoiseModel: The constructed noise model + """ + noise_model = NoiseModel() + + if noise_type == 'depolarizing': + error = depolarizing_error(noise_level, 1) # 1-qubit depolarizing error + noise_model.add_all_qubit_quantum_error(error, ['h', 'cx', 'measure']) + elif noise_type == 'amplitude_damping': + error = amplitude_damping_error(noise_level) + noise_model.add_all_qubit_quantum_error(error, ['h', 'cx', 'measure']) + elif noise_type == 'phase_damping': + error = phase_damping_error(noise_level) + noise_model.add_all_qubit_quantum_error(error, ['h', 'cx', 'measure']) + else: + raise ValueError("Unsupported noise type. Choose from 'depolarizing', 'amplitude_damping', or 'phase_damping'.") + + return noise_model + +def apply_noise_to_circuit(circuit, noise_model): + """ + Apply a noise model to a quantum circuit. + + Parameters: + - circuit: QuantumCircuit object + - noise_model: NoiseModel object to apply + + Returns: + - QuantumCircuit: The circuit with noise applied + """ + return circuit.decompose() # Decompose the circuit to apply noise + +def run_circuit_with_noise(circuit, noise_model): + """ + Run the quantum circuit with the specified noise model and return the results. + + Parameters: + - circuit: QuantumCircuit object + - noise_model: NoiseModel object to apply + + Returns: + - counts: Measurement results + - statevector: State vector of the quantum system + """ + # Use the Aer's qasm_simulator + simulator = AerSimulator() + + # Execute the circuit on the qasm simulator with noise + job = execute(circuit, simulator, shots=1024, noise_model=noise_model) + result = job.result() + + # Get measurement counts + counts = result.get_counts(circuit) + + # Get the state vector for visualization + statevector = Statevector.from_dict(counts) + + return counts, statevector + +def visualize_results(counts, statevector): + """ + Visualize the results of the noise simulation. + + Parameters: + - counts: Measurement results + - statevector: State vector of the quantum system + """ + print("Counts:", counts) + plot_histogram(counts).show() + plot_bloch_multivector(statevector).show() + +if __name__ == "__main__": + # Example usage of the noise simulation functions + num_qubits = 2 + circuit = QuantumCircuit(num_qubits, num_qubits) + circuit.h(0) # Apply Hadamard to the first qubit + circuit.cx(0, 1) # Apply CNOT to create entanglement + circuit.measure(range(num_qubits), range(num_qubits)) # Measure all qubits + + # Create a noise model + noise_model = create_noise_model(noise_type='depolarizing', noise_level=0.1) + + # Run the circuit with noise + counts, statevector = run_circuit_with_noise(circuit, noise_model) + + # Visualize the results + visualize_results(counts, statevector)