Journal
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
Volume 51, Issue 12, Pages 3941-3950Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10773-012-1286-4
Keywords
Collective-dephasing noise; Quantum secure direct communication; Quantum cryptography
Categories
Funding
- National Science Council of Republic of China [NSC 100-2221-E-006-152-MY3]
- Research Center for Quantum Communication and Security, National Cheng Kung University, Taiwan, Republic of China [D100-36002]
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Recently, Ge and Liu (Chin. Phys. Lett. 24(10):2727-2729, 2007) proposed a quantum secure direct communication (QSDC) protocol using a decoherence-free subspace (DFS) against collective-dephasing noise. Users of their protocol can directly recover the secret message after quantum transmission without transmission of any additional classical information except for the eavesdropping check. This study points out a pitfall in Ge and Liu's scheme, in which an eavesdropper can deliberately modify the message without being detected. Furthermore, an enhanced scheme is proposed to avoid the modification attack and to improve the qubit efficiency from 8.3 % to 12.5 %.
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