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Explicit attacks on the Bennett-Brassard 1984 protocol with partially distinguishable photonsстатья
- Авторы: Babukhin D., Kronberg D., Sych D.
- Журнал: Physical Review A - Atomic, Molecular, and Optical Physics
- Том: 106
- Номер: 4
- Год издания: 2022
- Издательство: American Physical Society
- Местоположение издательства: United States
- Номер статьи: 042403
- DOI: 10.1103/PhysRevA.106.042403
- Аннотация: The distinguishability of photons in nonoperational degrees of freedom compromises the unconditional security of quantum key distribution since an eavesdropper can improve attack strategies by exploiting this distinguishability. However, the optimal eavesdropping strategies in the presence of light-source side channels are not known. Here we provide several explicit attack strategies on the Bennett-Brassard 1984 (BB84) protocol with partially distinguishable photons. In particular, we consider the phase-covariant cloning attack, which is optimal in the absence of side channels, and show that there are even better strategies in the presence of side channels. The improved strategies exploit a measurement of the side-channel state followed by an attack on the signal photon. Our results explicitly demonstrate a reduction of the critical error rate and set an upper bound on the practical secret key rate.
- Добавил в систему: Кронберг Дмитрий Анатольевич