Abstract
SummaryIn this letter, we derive the maximal achievable secret key rates for continuous‐variable quantum key distribution (CVQKD) over free‐space optical (FSO) quantum channels. We provide a channel decomposition for FSO‐CVQKD quantum channels and study the SNR (signal‐to‐noise ratio) characteristics. The analytical derivations focus particularly on the low‐SNR scenarios. The results are convenient for wireless quantum key distribution and for the quantum Internet.
Highlights
Free-space optical (FSO) quantum links[1,2,3,4,5,6] provide a tool to implement quantum communications via wireless telecommunication[6,7,8,9,10] network infrastructures
As an integrated component of future quantum Internet[11,12,13,14,15,16] and long-distance quantum communications,[11,17,18,19,20,21,22,23,24,25,26,27,28,29] the FSO quantum channels could play a significant role in the global-scale practical implementations of quantum communications and quantum key distribution (QKD).[1,2,3,30,31,32,33,34,35,36,44,45,46,47,48,49]
The achievable secret key rates in a multicarrier Continuous-variable quantum key distribution (CVQKD) setting have been proven in Gyongyosi and Imre.[47]
Summary
Free-space optical (FSO) quantum links[1,2,3,4,5,6] provide a tool to implement quantum communications via wireless telecommunication[6,7,8,9,10] network infrastructures. The channel characteristics of the FSO quantum links are approachable via the mathematical framework of the GG (gamma-gamma) distribution.[6,7,8,9,10] The secret key rates for CVQKD schemes over FSO links and the performance of free-space quantum links in diverse environmental conditions raise several questions and call for further examination. Another interesting problem is the private classical capacity[4] of a GG link.
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