Create twoq.py

Author: mhjensen

doc/Programs/Sensing/twoq.py

@@ -0,0 +1,54 @@
+import numpy as np
+from qiskit import QuantumCircuit, execute, Aer
+
+# Define the number of qubits
+num_qubits = 2
+
+# Create a quantum circuit with the specified number of qubits
+qc = QuantumCircuit(num_qubits)
+
+# Apply a Hadamard gate to the first qubit to create a superposition
+qc.h(0)
+
+# Apply a CNOT gate to entangle the two qubits
+qc.cx(0, 1)
+
+# Apply a time-dependent field to the system
+time = np.linspace(0, 10, 101)
+field_strength = 0.1 * np.sin(2 * np.pi * time)
+
+for t, B in zip(time, field_strength):
+    # Apply a rotation around the Z-axis with the time-dependent field strength
+    qc.rz(B, 1)
+    qc.barrier()
+
+# Measure the qubits
+qc.measure_all()
+
+# Execute the circuit on a simulator
+backend = Aer.get_backend('qasm_simulator')
+job = execute(qc, backend, shots=1024)
+result = job.result()
+
+# Get the measurement counts
+counts = result.get_counts(qc)
+
+# Print the measurement results
+print("Measurement results:")
+for state, count in counts.items():
+    print(f"{state}: {count}")
+
+"""
+Here's a breakdown of the code:
+
+1. We import the necessary libraries from Qiskit, a popular open-source software development kit for working with quantum computers.
+2. We define the number of qubits to be 2.
+3. We create a quantum circuit with the specified number of qubits.
+4. We apply a Hadamard gate to the first qubit to create a superposition.
+5. We apply a CNOT gate to entangle the two qubits.
+6. We apply a time-dependent field to the system by rotating the second qubit around the Z-axis with a field strength that varies sinusoidally over time.
+7. We measure the qubits and execute the circuit on a simulator.
+8. We print the measurement results, showing the counts for each possible measurement outcome.
+
+This code can be used as a starting point for quantum sensing applications, where the time-dependent field can be used to probe the environment and detect changes or anomalies. The entanglement between the qubits can enhance the sensitivity of the measurement, making it a powerful tool for various quantum sensing applications.
+"""