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2013 | OriginalPaper | Buchkapitel
An Analysis of the Ping-Pong Protocol Operation in a Noisy Quantum Channel
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A generalized approach to Ping-Pong protocol analysis is introduced. The method is based on investigation of the density operator describing joint systems of communicating parties and an eavesdropper. The method is more versatile than approaches used so far as it permits on incorporation of different noise models in a unified way and make use of well grounded theory of quantum discrimination in estimation of eavesdropper’s information gain. As the proof of the method usefulness an example of its application to the analysis of the protocol execution over depolarizing and dephasing channels is given.