From Fundamental Dynamics to Applied Cryptography: Studies on the Quantum Speed Limit and Fully Passive Quantum Key Distribution

TL;DR

This thesis explores the fundamental physical limits of quantum dynamics and the practical implementation of secure quantum communication networks, advancing understanding in quantum information processing.

Contribution

It provides new insights into quantum speed limits and demonstrates progress towards fully passive quantum key distribution systems.

Findings

Analysis of quantum speed limits under various conditions

Design principles for passive quantum key distribution

Enhanced security protocols for quantum communication

Abstract

This thesis studies two distinct frontiers of quantum information processing: the fundamental physical limits of dynamical evolution and the practical realization of secure quantum communication networks.