期刊
CHINESE PHYSICS B
卷 22, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/22/6/060307
关键词
quantum steganography; GHZ(4) entangled state; quantum cryptography; quantum communication
资金
- National Natural Science Foundation of China [61170272, 61272514, 61003287, 61070163]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20100005120002]
- Fok Ying Tong Education Foundation [131067]
- Natural Science Foundation of Shandong Province, China [ZR2011FM023]
- Outstanding Research Award Fund for Young Scientists of Shandong Province, China [BS2011DX034]
- Fundamental Research Funds for Central Universities of China [BUPT2012RC0221]
Quantum steganography that utilizes the quantum mechanical effect to achieve the purpose of information hiding is a popular topic of quantum information. Recently, El Allati et al. proposed a new quantum steganography using the GHZ(4) state. Since all of the 8 groups of unitary transformations used in the secret message encoding rule change the GHZ(4) state into 6 instead of 8 different quantum states when the global phase is not considered, we point out that a 2-bit instead of a 3-bit secret message can be encoded by one group of the given unitary transformations. To encode a 3-bit secret message by performing a group of unitary transformations on the GHZ(4) state, we give another 8 groups of unitary transformations that can change the GHZ(4) state into 8 different quantum states. Due to the symmetry of the GHZ(4) state, all the possible 16 groups of unitary transformations change the GHZ(4) state into 8 different quantum states, so the improved protocol achieves a high efficiency.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据