Entanglement-Enhanced Classical Communication

TL;DR

This thesis explores how quantum entanglement can enhance classical communication, reviewing quantum channel capacity, non-locality, and proposing new classification methods for entangled states, aiming to inform future quantum communication technologies.

Contribution

Introduces a quadratic classification method for entangled states and reviews fundamental quantum non-locality concepts to enhance classical communication strategies.

Findings

Entanglement can improve classical communication capacity.

Proposed a new quadratic classification for entangled states.

Reviewed quantum non-locality's role in communication enhancement.

Abstract

This thesis will be focused on the classical capacity of quantum channels, one of the first areas treated by quantum information theorists. The problem is fairly solved since some years. Nevertheless, this work will give me a reason to introduce a consistent formalism of the quantum theory, as well as to review fundamental facts about quantum non-locality and how it can be used to enhance communication. Moreover, this reflects my dwelling in the spirit of classical information theory, and it is intended to be a starting point towards a thorough study of how quantum technologies can help to shape the future of telecommunications. Whenever it was possible, heuristic reasonings were introduced instead of rigorous mathematical proofs. This finds an explanation in that I am a self-taught neophyte in the field, and just about every time I came across a new concept, physical arguments were always more compelling to me than just maths. The technical content of the thesis is twofold. On one hand, a quadratic classification based on optimization programs that I devised for distinguishing entangled states is presented in Chapter 4. In second place, a less difficult yet I hope equally interesting technical part consists of versions of some proofs throughout the text.