From Intra-Datacenter Interconnects to Metro Networks: Does CV-QKD Need Loss- or Bandwidth-Conscious Receivers?
Florian Honz (1), Fabian Laudenbach (2), Hannes H\"ubel (1), Philip, Walther (3), Bernhard Schrenk (1) ((1) AIT Austrian Institute of Technology,, (2) AIT Austrian Institute of Technology (now with Xanadu Quantum Tech), (3), University of Vienna, Faculty of Physics)
TL;DR
This paper experimentally compares two CV-QKD receiver architectures, revealing that loss-optimized heterodyne performs better at longer distances, while bandwidth-optimized intradyne offers higher secure-key rates at shorter reach.
Contribution
It provides a direct experimental comparison of loss- and bandwidth-optimized CV-QKD receivers, highlighting their respective advantages for different link distances.
Findings
Loss-optimized heterodyne outperforms at medium/long reach
Bandwidth-optimized intradyne achieves 5-9 dB higher secure-key rate at short reach
Different receiver designs suit different network scenarios
Abstract
We experimentally compare a loss-optimized coherent heterodyne and a bandwidth-blessed intradyne CV-QKD architecture. We find the former to prevail performance-wise for medium/long link reach, while the latter features a 5-9 dB higher secure-key rate over short reach.
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Taxonomy
TopicsQuantum-Dot Cellular Automata · Advancements in Semiconductor Devices and Circuit Design · Quantum and electron transport phenomena