An improved rate region for the classical-quantum broadcast channel

TL;DR

This paper introduces a larger achievable rate region for the two-user classical-quantum broadcast channel, extending classical results using polar coding techniques adapted for quantum information theory.

Contribution

It generalizes the classical Marton-Gelfand-Pinsker region to quantum channels, utilizing polar coding for improved rate bounds.

Findings

The new region is provably larger than previous bounds.

Polar coding is effectively adapted for quantum broadcast channels.

The approach advances quantum network information theory.

Abstract

We present a new achievable rate region for the two-user binary-input classical-quantum broadcast channel. The result is a generalization of the classical Marton-Gelfand-Pinsker region and is provably larger than the best previously known rate region for classical-quantum broadcast channels. The proof of achievability is based on the recently introduced polar coding scheme and its generalization to quantum network information theory.