@inbook{517019c843c24b4baad845ad9e800492,
title = "Ping-pong protocol eavesdropping in almost perfect channels",
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{\textendash}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.",
keywords = "Ping-pong protocol, Quantum direct communication",
author = "Piotr Zawadzki",
note = "Publisher Copyright: {\textcopyright} Springer International Publishing Switzerland 2016.",
year = "2016",
doi = "10.1007/978-3-319-39207-3\_23",
language = "English",
isbn = "9783319392066",
series = "Communications in Computer and Information Science",
publisher = "Springer Verlag",
pages = "260--268",
editor = "Piotr Gaj and Andrzej Kwiecie{\'n} and Piotr Stera",
booktitle = "Computer Networks - 23rd International Conference, CN 2016, Proceedings",
address = "Germany",
}