Energy-constrained two-way capacities of the pure-loss channel
Alessandro Falco Francesco Anna Mele Ludovico Lami Vittorio Giovannetti
作者信息
Abstract
We determine the two-way quantum and secret-key capacities of the pure-loss channel under an average input photon-number constraint. For transmissivity $η$ and photon budget $N$, both capacities equal $g(N)-g((1-η)N)$, where $g$ is the entropy of a thermal state. This coincides with the rate achieved by the known reverse coherent information of a two-mode squeezed vacuum. Our result provides the last missing capacity formula for the celebrated pure-loss channel, completing the picture of bosonic quantum communication under pure loss.引用本文复制引用
Alessandro Falco,Francesco Anna Mele,Ludovico Lami,Vittorio Giovannetti.Energy-constrained two-way capacities of the pure-loss channel[EB/OL].(2026-10-08)[2026-10-12].https://arxiv.org/abs/2610.12365.学科分类
物理学
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