Entanglement enhanced bit rate over multiple uses of a lossy bosonic channel with memory

TL;DR

This paper investigates how entanglement across multiple uses of a lossy bosonic channel with memory can increase classical information transmission rates, demonstrating that collective encoding improves performance over memoryless channels.

Contribution

It provides a comparative analysis showing that entanglement and collective encoding enhance bit rates in channels with memory, a novel insight for quantum communication.

Findings

Memory enhances bit rate with entangled states

Collective encoding outperforms independent encoding

Entanglement benefits are significant in lossy bosonic channels

Abstract

We present a study of the achievable rates for classical information transmission via a lossy bosonic channel with memory, using homodyne detection. A comparison with the memoryless case shows that the presence of memory enhances the bit rate if information is encoded in collective states, i.e. states which are entangled over different uses of the channel.