A GHZ quantum circuit is a quantum computing system that includes 3 entangled qubits.
A Greenberger–Horne–Zeilinger state (GHZ state) is a certain type of entangled quantum state that involves at least three subsystems.
Demo in IBM Quantum Composer.
Great comment. In fact, both configurations are valid GHZ circuits.
The difference between the two GHZ state configurations lies in the order of the CNOT gates applied and which qubits serve as control and target. However, both methods result in the same final state.
Config 1
Config 2
Both sequences of CNOT gates achieve the ghz entanglement. Thank you.