For CubeSat downlink QKD modeled with an elliptical beam channel, efficient BB84 consistently beats standard BB84 in both finite-size and asymptotic key rates.
A short review on quantum identity authentication pro- tocols: how would Bob know that he is talking with Alice? Quantum Information Processing, 21(11):369, 2022
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Finite and Asymptotic Key Analysis for CubeSat-Based BB84 QKD with Elliptical Beam Approximation
For CubeSat downlink QKD modeled with an elliptical beam channel, efficient BB84 consistently beats standard BB84 in both finite-size and asymptotic key rates.