Quantum information splitting of a two-qubit Bell state using a four-qubit entangled state  

作　　者：李冬芬 王瑞锦 张凤荔 

机构地区：[1]University of Electronic Science and Technology of China

出　　处：《Chinese Physics C》2015年第4期26-30,共5页中国物理C（英文版）

基　　金：Supported by Fundamental Research Funds for the Central Universi-ties(ZYGX2011J064);National Nature Science Foundation of China(60903157,61133016);National High Technology Joint Research Program of China(863 Program,2011AA010706)

摘　　要：A scheme is proposed for quantum information splitting of a two-qubit Bell state by using a four-qubit entangled state as a quantum channel. In the scenario, it is supposed that there axe three legitimate parties, say Alice, Bob and Chaxlie. Alice is the sender of quantum information. Bob and Charlie are two agents. Alice first performs GHZ state measurement and tells Bob and Chaxlie the measurement results via a classical channel. It is impossible for Bob to reconstruct the original state with local operations unless help is obtained from Chaxlie. If Chaxlie allows Bob to reconstruct the original state information, he needs to perform a single-qubit measurement and tell Bob the measurement result. Using the measurement results from Alice and Charlie, Bob can reconstruct the original state. We also consider the problem of security attacks. This protocol is considered to be secure.A scheme is proposed for quantum information splitting of a two-qubit Bell state by using a four-qubit entangled state as a quantum channel. In the scenario, it is supposed that there axe three legitimate parties, say Alice, Bob and Chaxlie. Alice is the sender of quantum information. Bob and Charlie are two agents. Alice first performs GHZ state measurement and tells Bob and Chaxlie the measurement results via a classical channel. It is impossible for Bob to reconstruct the original state with local operations unless help is obtained from Chaxlie. If Chaxlie allows Bob to reconstruct the original state information, he needs to perform a single-qubit measurement and tell Bob the measurement result. Using the measurement results from Alice and Charlie, Bob can reconstruct the original state. We also consider the problem of security attacks. This protocol is considered to be secure.

关 键 词：quantum information quantum information splitting two-qubit Bell state GHZ state measurement 

分 类 号：O413.1[理学—理论物理]