2023/06/28 by Farzad Kianvash, Kianvash, Farzad, Marco Fanizza +3 · 1 citation
Computer Science · Engineering · #FOS: Physical sciences #Molecular Junctions and Nanostructures #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2306.16350
openalex publication_date 2023/06/28 · openalex created_date 2023/06/30 · openalex updated_date 2026/08/01
We present a comprehensive characterization of the interconnections between single-mode, phaseinsensitive Gaussian Bosonic Channels resulting from channel concatenation. This characterization enables us to identify, in the parameter space of these maps, two distinct regions: low-ground and high-ground. In the low-ground region, the information capacities are smaller than a designated reference value, while in the high-ground region, they are provably greater. As a direct consequence, we systematically outline an explicit set of upper bounds for the quantum and private capacity of these maps, which combine known upper bounds and composition rules, improving upon existing results.