Abstract
We have performed a series of feasibility tests toward deployment of quantum key distribution (QKD) systems in commercial optical fiber TELECOM network. By monitoring of the operation of selected state-of-the-art QKD systems with a typical commercial imperfect communication line in the role of quantum dark channel we have assessed stability and reliability of two quantum cryptography systems, on nonentangled and on entangled photons. The quantum bit error was the main observed parameter which allowed for quantitative assessment of both systems operation efficiency and their resistivity to random perturbations including hacker attacks in noisy environment. The comparison of both systems with respect to their tolerance against noise and technical imperfections of a dark quantum channel has been presented.
Highlights
The progress in quantum cryptography is related with implementation of quantum key distribution (QKD) scheme for symmetric OTP (One Time Pad) cryptography system upon the BB84 (Bennett and Brassard 1984), Sarg04 (Scarani et al 2004) and E91 (Ekert 1991) protocols
In the present paper we report the comparison of two commercial nonentangled and entangled QKD systems tested versus quality of the quantum dark channel with emphasizing of feasibility study toward potential deployment of QKD systems in commercial TELECOM optical fiber network infrastructure
We have tested several typical commercial communication patch-cords of optical fibers supplied by the TELECOM company, which were the same as installed in metropolitan network
Summary
The progress in quantum cryptography is related with implementation of quantum key distribution (QKD) scheme for symmetric OTP (One Time Pad) cryptography system upon the BB84 (Bennett and Brassard 1984), Sarg (Scarani et al 2004) and E91 (Ekert 1991) protocols. The latter protocol is addressed to entangled flying qubits (pair of quantumly entangled photons) whereas two former ones are referred to nonentangled quantum. Though the particular practical implementations of the entangled and nonentangled QKD schemes differ significantly, in both cases the quality of quantum dark channel determines constraints and limits for secure communication and discriminates both its range and speed. In the present paper we report the comparison of two commercial nonentangled and entangled QKD systems tested versus quality of the quantum dark channel with emphasizing of feasibility study toward potential deployment of QKD systems in commercial TELECOM optical fiber network infrastructure
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