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Abstract: A quantum protocol for sharing an arbitrary two-qubit state between N partiesis introduced. Any of the members, can retrieve the state, only withcollaboration of the other parties. We will show that in terms of resources,i.e. the number of classical bits, the number of Bell pairs shared, and alsothe type of measurements, our protocol is more efficient. For achieving this,we introduce the basic technique of secure passing of an unknown two qubitstate among a sequence of parties, none of which can retrieve the state withoutauthorization of the sender and the other members of the group.



Autor: Razieh Annabestani, Vahid Karimipour

Fuente: https://arxiv.org/







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