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Title: The Throughput Bottleneck of Quantum-secure Communication Links: Analysis and Mitigation
Authors: Guerra Yánez,Carlos 
Mederos Barrera,Antonio 
De Marco, Innocenzo
Orsucci, Davide
Moll, Florian
Ghassemlooy, Zabih
Zvanovec, Stanislav
UNESCO Clasification: 3325 Tecnología de las telecomunicaciones
Keywords: Ciphers
Optical Communication
Protocols, et al
Issue Date: 2024
Journal: IEEE Transactions on Communications 
Abstract: The use of quantum key distribution (QKD) to improve security may impact the quality of service (Qos) of high rate classical data links. The key generation process with an empty buffer can be modeled as a queuing system, and data throughput limits can be determined using queueing theory to assess the impact on the QoS. The proposed key generation model is based on an on-demand paradigm. Based on the results of this study, a discrete variable (DV)-QKD-secured link could be designed using the data rate bounds to guarantee a given QoS. Furthermore, we validate the derived bounds by comparing the theoretical derivations with simulations. We show that in a one-time-pad system, the achievable throughput approaches 0.59 times the secret key rate as the key length increases. In the case of a key scheme with key reuse, the throughput is asymptotically linear with the number of key reuses, and the slope of the curve corresponds to the secret key rate multiplied by a function of the protocol and channel characteristics. The analysis is carried out on optical fiber and free-space links.
ISSN: 0090-6778
DOI: 10.1109/TCOMM.2024.3394746
Source: IEEE Transactions on Communications[ISSN 0090-6778], (Enero 2024)
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