Quantum Information Transmission over a Partially Degradable Channel

TL;DR

This paper explores quantum communication over partially degradable channels, demonstrating that their unique properties enable higher data rates and more efficient protocols compared to traditional degradable channels.

Contribution

It introduces a coding scheme for PD channels and quantifies achievable quantum communication rates, highlighting advantages for experimental quantum communication.

Findings

PD channels allow higher quantum data rates than degradable channels

Partial degradability facilitates practical implementation of quantum protocols

The proposed coding scheme improves quantum communication efficiency

Abstract

We investigate a quantum coding for quantum communication over a PD (partially degradable) degradable quantum channel. For a PD channel, the degraded environment state can be expressed from the channel output state up to a degrading map. PD channels can be restricted to the set of optical channels which allows for the parties to exploit the benefits in experimental quantum communications. We show that for a PD channel, the partial degradability property leads to higher quantum data rates in comparison to those of a degradable channel. The PD property is particular convenient for quantum communications and allows one to implement the experimental quantum protocols with higher performance. We define a coding scheme for PD-channels and give the achievable rates of quantum communication.