Bell State

How the CNOT Gate Turns Qubits Into Entangled Pairs

Multi-qubit gates, like the CNOT gate, are fundamental to quantum computing for creating entanglement, where qubit states are correlated and cannot be described independently. The CNOT gate's conditional operation, flipping a target qubit only if the control qubit is in the |1⟩ state, is the key mechanism for generating these entangled states, such as Bell and GHZ states.