Abstract
An undetectable eavesdropping of the entanglement based quantum direct communication in lossy quantum channels has already been demonstrated by Zhang et al. (Phys Lett A 333(12):46–50, 2004). The circuit proposed therein induces losses at a constant 25 % rate. Skipping of some protocol cycles is advised in situations when the induced loss rate is too high. However, such policy leads to a reduction in information gain proportional to the number of skipped cycles.
The entangling transformation, parametrized by the induced loss ratio, is proposed. The new method permits fine-tuning of the loss ratio by a modification of coupling coefficients. The proposed method significantly improves efficiency of the attack operated in the low loss regime. The other properties of the attack remain the same.
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Acknowledgement
Author acknowledges the support by the Polish Ministry of Science and Higher Education under research project 8686/E-367/S/2015.
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Zawadzki, P. (2016). Ping-Pong Protocol Eavesdropping in Almost Perfect Channels. In: Gaj, P., Kwiecień, A., Stera, P. (eds) Computer Networks. CN 2016. Communications in Computer and Information Science, vol 608. Springer, Cham. https://doi.org/10.1007/978-3-319-39207-3_23
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DOI: https://doi.org/10.1007/978-3-319-39207-3_23
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