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Abstract: If n researchers participate in a nuclear bomb project, they share the classified information. However, they think there is a spy in the group, so they decide that the nuclear bomb can be accessed only by working collaboratively with any k of them (i.e., (k-1) people cannot access the bomb). How can this be achieved? I will talk about how GHZ states can be used to share the quantum secret between two parties, so that they need to work together to reconstruct the original information, and how to prevent an eavesdropper. At the end, we will see how this technique can be generalized to higher dimensions. The talk is mainly based on the paper Hillery, M., Buzek, V., Berthiaume, A.: Quantum secret sharing. Phys. Rev. A 59(3), 1829Ã¢Â€Â“1834 (1999).