Figure 5
From: Finite-resource teleportation stretching for continuous-variable systems
Secret-key capacity of a chain of N equidistant repeaters creating N + 1 additive-noise Gaussian channels with variances \({\xi }_{i}=\xi /(N+\mathrm{1)}\). We compare the finite-resource upper bound \({\rm{\Psi }}(\{{ {\mathcal E} }_{i}\})\) (solid lines) with the infinite-energy upper bound \({\rm{\Phi }}(\{{ {\mathcal E} }_{i}\})\) (dashed lines) for different values of N as a function of the overall added noise of the chain ξ.
