The power of entangled quantum channels

TL;DR

This paper explores how entangled quantum channels can significantly enhance communication capacity compared to unentangled channels by leveraging quantum correlations, demonstrating potential for higher data rates at fixed power levels.

Contribution

It introduces a trade-off analysis between power and communication rate for coupled quantum channels, highlighting the advantages of entanglement in quantum communication.

Findings

Entangled channels can transmit M bits simultaneously, outperforming unentangled channels.

Quantum correlations enable higher communication rates at the same power.

Entanglement offers a fundamental advantage in quantum communication efficiency.

Abstract

All communication channels are at bottom quantum mechanical. Quantum mechanics contributes both obstacles to communication in the form of noise, and opportunities in the use of intrinsically quantum representations for information. This paper investigates the trade-off between power and communication rate for coupled quantum channels. By exploiting quantum correlations such as entanglement, coupled quantum channels can communicate at a potentially higher rate than unentangled quantum channels given the same power. In particular, given the same overall power, M coupled, entangled quantum channels can send M bits in the same time it takes a single channel to send a single bit, and in the same time it takes M unentangled channels to send $\sqrt M$ bits.