For CubeSat downlink QKD modeled with an elliptical beam channel, efficient BB84 consistently beats standard BB84 in both finite-size and asymptotic key rates.
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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.