Entanglement swapping of a GHZ state via a GHZ-like state

This study uses the Greenberger-Horne-Zeilinger (GHZ)-like state |G > = 1/2 (|001 > + |010 > + |100 > + |111 >) to establish an entanglement swapping protocol on a pure GHZ state. A quantum circuit is proposed to assist in teleporting the entanglement of the pure GHZ state. Furthermore, on the basis of the generation of the GHZ-like state, an improved protocol to reduce the number of transmitted photons required in the process of entanglement swapping is proposed.