High-speed Privacy Amplification Scheme using GMP in Quantum Key Distribution
This work addresses a critical performance issue for quantum key distribution systems, though it appears incremental as it builds on existing methods with library optimizations.
The paper tackled the bottleneck of privacy amplification throughput in high-speed discrete variable quantum key distribution by presenting a modular arithmetic hash scheme using the GNU multiple precision library, achieving throughputs of 260 Mbps and 140 Mbps on different block sizes.
Privacy amplification (PA) is the art of distilling a highly secret key from a partially secure string by public discussion. It is a vital procedure in quantum key distribution (QKD) to produce a theoretically unconditional secure key. The throughput of PA has become a bottleneck of the high-speed discrete variable QKD (DV-QKD) system. In this paper, a high-speed modular arithmetic hash PA scheme with GNU multiple precision (GMP) arithmetic library is presented. This scheme is implemented on two different central processing unit (CPU) platforms. The experimental results demon-strate that the throughput of this scheme achieves 260Mbps on the block size of 10^6 and 140Mbps on the block size of 10^8. This is the highest-speed recorded PA scheme on CPU platform to the author's knowledge.