Attaining classical capacity per unit cost of noisy bosonic Gaussian channels

TL;DR

This paper demonstrates that the classical capacity per unit cost of noisy bosonic Gaussian channels can be achieved using simple modulation and measurement techniques, reaching the quantum limit without complex detection methods.

Contribution

It introduces a practical scheme employing generalized on-off keying and projective measurements to attain the quantum limit of capacity per unit cost in optical channels.

Findings

Capacity per unit cost is achievable with simple modulation and measurement.

No need for complex collective measurements or phase-sensitive detection.

Reaches the ultimate quantum limit in low-cost regimes.

Abstract

I show that classical capacity per unit cost of noisy bosonic Gaussian channels can be attained by employing generalized on-off keying modulation format and a projective measurement of individual output states. This means that neither complicated collective measurements nor phase-sensitive detection is required to communicate over optical channels at the ultimate limit imposed by laws of quantum mechanics in the limit of low average cost.