Hierarchical and probabilistic quantum information splitting of an arbitrary two-qubit state via two cluster states  

作　　者：Wen-Ming Guo Lei-Ru Qin 郭文明;秦蕾茹(School of Software Engineering, Beijing University of Posts and Telecommunications)

机构地区：School of Software Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

出　　处：《Chinese Physics B》2018年第11期382-389,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61671087)

摘　　要：Based on non-maximally entangled four-particle cluster states, we propose a new hierarchical information splitting protocol to probabilistically realize the quantum state sharing of an arbitrary unknown two-qubit state. In this scheme, the sender transmits the two-qubit secret state to three agents who are divided into two grades with two Bell-state measurements,and broadcasts the measurement results via a classical channel. One agent is in the upper grade and two agents are in the lower grade. The agent in the upper grade only needs to cooperate with one of the other two agents to recover the secret state but both of the agents in the lower grade need help from all of the agents. Every agent who wants to recover the secret state needs to introduce two ancillary qubits and performs a positive operator-valued measurement（POVM） instead of the usual projective measurement. Moreover, due to the symmetry of the cluster state, we extend this protocol to multiparty agents.Based on non-maximally entangled four-particle cluster states, we propose a new hierarchical information splitting protocol to probabilistically realize the quantum state sharing of an arbitrary unknown two-qubit state. In this scheme, the sender transmits the two-qubit secret state to three agents who are divided into two grades with two Bell-state measurements,and broadcasts the measurement results via a classical channel. One agent is in the upper grade and two agents are in the lower grade. The agent in the upper grade only needs to cooperate with one of the other two agents to recover the secret state but both of the agents in the lower grade need help from all of the agents. Every agent who wants to recover the secret state needs to introduce two ancillary qubits and performs a positive operator-valued measurement（POVM） instead of the usual projective measurement. Moreover, due to the symmetry of the cluster state, we extend this protocol to multiparty agents.

关 键 词：cluster state hierarchical quantum information splitting positive operator-valued measurement （POVM） 

分 类 号：O4[理学—物理]