Create noise_simulation.py

quantum/simulations/noise_simulation.py

@@ -0,0 +1,93 @@
+# noise_simulation.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
+from qiskit.quantum_info import Statevector
+
+def create_noise_circuit():
+    """
+    Create a simple quantum circuit with a Hadamard gate and a measurement.
+    
+    Returns:
+    - QuantumCircuit: The constructed quantum circuit
+    """
+    circuit = QuantumCircuit(1, 1)  # 1 qubit and 1 classical bit
+
+    # Apply a Hadamard gate to create superposition
+    circuit.h(0)
+
+    # Measure the qubit
+    circuit.measure(0, 0)
+
+    return circuit
+
+def add_noise_model(circuit, noise_level=0.1):
+    """
+    Add a depolarizing noise model to the quantum circuit.
+    
+    Parameters:
+    - circuit: QuantumCircuit object
+    - noise_level: Level of noise to apply (0 to 1)
+    
+    Returns:
+    - NoiseModel: The noise model applied to the circuit
+    """
+    noise_model = NoiseModel()
+    error = depolarizing_error(noise_level, 1)  # 1-qubit depolarizing error
+    noise_model.add_all_qubit_quantum_error(error, ['h', 'measure'])
+    return noise_model
+
+def run_noise_simulation(noise_level=0.1):
+    """
+    Run the noise simulation and return the results.
+    
+    Parameters:
+    - noise_level: Level of noise to apply (0 to 1)
+    
+    Returns:
+    - Counts of the measurement results
+    - Statevector of the quantum system
+    """
+    # Create the noise circuit
+    circuit = create_noise_circuit()
+
+    # Add noise to the circuit
+    noise_model = add_noise_model(circuit, noise_level)
+
+    # 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__":
+    noise_level = 0.1  # Level of noise to apply
+
+    # Run the noise simulation
+    counts, statevector = run_noise_simulation(noise_level)
+
+    # Visualize the results
+    visualize_results(counts, statevector)