Experimental investigation of tripartite entanglement and nonlocality in three-qubit generalized Greenberger-Horne-Zeilinger states

► We theoretically calculated the tripartite entanglement and expressed the expectation value of Mermin operator in three-qubit generalized Greenberger-Horne-Zeilinger (GGHZ) states. ► We demonstrate experimentally the theoretical results of tripartite entanglement and Mermin theorem successfully. ► The unique relationship between tripartite entanglement and tripartite nonlocality in GGHZ states have been shown.