Quantum Analogues for Two Simple Classical Channels

TL;DR

This paper explores quantum analogues of classical communication channels, revealing unique quantum effects on capacity and dynamics, including counterintuitive phenomena and time-dependent behaviors.

Contribution

It introduces quantum analogues of classical channels, analyzing their capacity dynamics and highlighting novel quantum effects not present in classical counterparts.

Findings

Quantum channels exhibit time-dependent capacity behaviors.

Quantum effects lead to counterintuitive phenomena in channel capacity.

Comparison between classical and quantum channels reveals fundamental differences.

Abstract

We present some of the peculiar dynamics of two simple sans-entanglement quantum communication channels in a digestible form. Specifically, we contrast the classical gaussian additive channel to its quantum analogue and find that the quantum version features a capacity with interesting time dependence and counterintuitive effects of quantization. We also consider a simple two-level system and comment on the time dependence of its capacity.