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This theoretical breakthrough demonstrates that Petz–Rényi channel information is strictly superadditive for Rényi parameters between 1/2 and 1, proving that joint usage of quantum channels enhances transmission reliability without increasing maximum capacity. The study reveals that even entanglement-breaking measurement channels can achieve this gain through classical correlations in separable input states, offering new protocols to reduce random-coding error exponents in practical quantum networks.
Petz–Rényi Channel Information Is Superadditive for Every α Between 1/2 and 1
New research demonstrates that Petz-Rényi channel information can be strictly superadditive for α between 1/2 and 1, enhancing entanglement-assisted communication reliability.
A new theoretical study has revealed that using multiple copies of a quantum communication channel in a correlated way can improve transmission reliability without increasing the maximum communication rate. Hao-Chung Cheng of the…
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