Fig. 5: Performance of multiplexed two-way protocol (MTP) with distance using secret-key rate as the metric.
From: Comparing one- and two-way quantum repeater architectures
The number of segments is shown in different colors and denoted by N. The plots in the top row consider a low gate error scenario with a gate error rate (ϵG) of 10−4 or 0.01%, and the bottom row plots show the performance with moderate gate errors (ϵG = 10−3 or 0.1%). The different columns show the performance in different coupling regimes, starting with a perfect coupling (ηc = 1), with the coupling coefficient reducing when moving from left to right (ηc ∈ {1, 0.9, 0.5, 0.3}). In this setup, we used the protocol based on one-way BB8469 Secret-key rate to inform the distillation decision-making process, allowing a maximum of one round of distillation at any level of nesting. Also, in this setup, no distillation is performed at the end level of nesting.
