Comment on "Deterministic six states protocol for quantum communication" [Phys. Lett. A 358 (2006) 85]

Details Comment on "Deterministic six states protocol for quantum communication" [Phys. Lett. A 358 (2006) 85] Comment on "Deterministic six states protocol for quantum communication" [Phys. Lett. A 358 (2006) 85]

2011-07-22

arxiv.org/abs/1107.4435v1

Physics Letters A 374 (2010) 1097-1100

Physics

Quantum Physics

7 pages, 2 figures

Scientific paper

In [J.S. Shaari, M. Lucamarini, M.R.B. Wahiddin, Phys. Lett. A 358 (2006) 85-90] the deterministic six states protocol (6DP) for quantum communication has been developed. This protocol is based on three mutually unbiased bases and four encoding operators. Information is transmitted between the users via two qubits from different bases. Three attacks have been studied; namely intercept-resend attack (IRA), double-CNOT attack (2CNOTA) and quantum man-in-the-middle attack. In this Letter, we show that the IRA and 2CNOTA are not properly addressed. For instance, we show that the probability of detecting Eve in the control mode of the IRA is 70% instead of 50% in the previous study. Moreover, in the 2CNOTA, Eve can only obtain 50% of the data not all of it as argued earlier.

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