Comment on 'Controlled DSQC using five-qubit entangled states and two-step security test'
| Autor: | Fu-Chen Zhu, Qiao-Yan Wen, Luo-Ming Meng, Su-Juan Qin |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Theoretical computer science
business.industry Quantum pseudo-telepathy Computer science Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Optics Quantum cryptography Alice and Bob law Qubit Electrical and Electronic Engineering Physical and Theoretical Chemistry Quantum information Telecommunications business Cryptanalysis Quantum information science Realization (systems) |
| Zdroj: | Optics Communications. 282:2656-2658 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2009.03.050 |
| Popis: | A controlled deterministic secure quantum communication protocol [X.M. Xiu, L. Dong, Y.J. Cao, F. Chi, Opt. Commun. 282 (2009) 333] with five-qubit entangled states was proposed recently. The aim of Xiu et al. was that the successful realization of communication between Alice and Bob needed the cooperation of a controller, Charlie. However, we show that the controller Charlie’s role could be excluded unknowingly. Moreover, an eavesdropper can entangle an ancilla without introducing any error in the first security test and then she can distill a quarter of the secret messages from her entangled ancilla. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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