Figure 1
From: Quantum Zeno repeaters

Illustrating the entanglement swapping procedure. Possessing two qubits, \(A_2\) entangled with Alice’s qubit \(A_1\), and \(B_2\) entangled with Bob’s qubit \(B_1\), Repeater performs operations and measurements on \(A_2\) and \(B_2\), leaving Alice’s and Bob’s qubits entangled.