Side channels of information leakage in quantum cryptography based on geometrically uniform coherent statesстатья
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Дата последнего поиска статьи во внешних источниках: 11 ноября 2020 г.
Аннотация:Quantum key distribution systems are open systems in the sense that in addition to attackingquantum states in the quantum communication channel, the eavesdropper can obtain additionalinformation about the transmitted key using passive radiation detection of the transmitting andreceiving stations, as well as active probing of the state of the equipment through a fibercommunication line. In this paper, we consider the cryptographic robustness of a quantumcryptography system that uses a protocol with phase coding based on strongly weakenedcoherent geometrically uniform states. Non-strict single-photon information states, as well asinformation leakage through side channels, are taken into account by the generalized DecoyState method, taking into account joint collective measurements of information quantum statesand quantum states in side channels. An estimate of the secret key length is obtained, which isexpressed only in terms of the observed values at the receiving station and the parameters ofquantum states in the side channels.