Comment on 'Two-way protocols for quantum cryptography with a nonmaximally entangled qubit pair'

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.036301· OSTI ID:21450676

Sujuan, Qin; Fei, Gao; Qiaoyan, Wen ^[1]; Fenzhuo, Guo ^[2]

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1. State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876 (China)
2. School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876 (China)

Three protocols of quantum cryptography with a nonmaximally entangled qubit pair [Phys. Rev. A 80, 022323 (2009)] were recently proposed by Shimizu, Tamaki, and Fukasaka. The security of these protocols is based on the quantum-mechanical constraint for a state transformation between nonmaximally entangled states. However, we find that the second protocol is vulnerable under the correlation-elicitation attack. An eavesdropper can obtain the encoded bit M although she has no knowledge about the random bit R.

• OSTI ID: 21450676
• Journal Information: Physical Review. A, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevA.82.036301; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORRELATIONS
QUANTUM CRYPTOGRAPHY
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
QUBITS
RANDOMNESS
SECRECY PROTECTION
TRANSFORMATIONS
CRYPTOGRAPHY
INFORMATION
MECHANICS
QUANTUM INFORMATION