from qiskit import QuantumCircuit, QuantumRegister q = QuantumRegister(2, 'q') circ = QuantumCircuit(q) circ.h(q[0]) circ.h(q[1]) circ.cx(q[0], q[1]) circ.barrier() circ.cx(q[1], q[0]) circ.h(q[0]) circ.h(q[1]) circ.measure_all()
from qiskit import QuantumCircuit, QuantumRegister q = QuantumRegister(2, 'q') circ = QuantumCircuit(q) circ.h(q[0]) circ.h(q[1]) circ.cx(q[0], q[1]) circ.barrier(q[0], q[1]) circ.measure(q)In this example, we’ve created a quantum register with 2 qubits, initialized a quantum circuit, and performed various operations on the qubits, including a CX gate (controlled NOT gate) to create entanglement. We’ve then used the `.barrier(q[0], q[1])` function to group together the operations performed on both qubits, and placed a measurement at the end of the circuit. Overall, the quantum circuit barrier function is a useful tool for grouping together operations, visualizing the behavior of a circuit, and better understanding the behavior of entangled qubits.