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Analyzing and Revising Quantum Dialogue Without Information Leakage Based on the Entanglement Swapping Between any Two Bell States and the Shared Secret Bell State |
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| Authors: | Liu Zhihao Chen Hanwu |
| Affiliation: | 1.School of Computer Science and Engineering, Southeast University, Nanjing, 211189, China ;2.Key Laboratory of Computer Network and Information Integration (Southeast University), Ministry of Education, Nanjing, 211189, China ;3.Faculty of Engineering and Information Technology, Centre for Quantum Software and Information, University of Technology Sydney, Sydney, NSW, 2007, Australia ; |
| Abstract: | Information leakage in quantum dialogue (QD) or bidirectional quantum secure direct communication (BQSDC) was found ten years ago, but enough attention was not paid and even wrong conclusions were drawn. It is indeed necessary to emphasize the importance. Here, we find information leakage exists in the QD protocol based on entanglement swapping between any two Bell states and the shared secret Bell state. To be specific, half of the interchanged information is leaked out unconsciously. This is not allowed in a truly secure QD protocol. Afterward, this QD protocol is improved to the one without information leakage. Compared with the original one, there are some obvious advantages in the improved version. |
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