Advanced Quantum Protocols for Quantum Information

Over the past few decades, quantum mechanics has revolutionized research across a wide range of fields, offering breakthroughs and capabilities unattainable by classical methods. The ability to generate and manipulate quantum states has opened the door to developing new technologies, especially in the field of information security. On one front, research is driving the development of new protocols aimed at enhancing the security provided by quantum technologies. On the other, quantum technologies such as quantum key distribution and quantum randomness generation have already reached the commercial stage, with efforts now focused on building national and global networks to secure classical communication. This doctoral thesis seeks to contribute to both of these areas. It explores the development of new security protocols through the study of quantum sequential protocols, where one or more parties interact with a quantum state sequentially, allowing for the reuse of quantum resources. Additionally, it advances the development of quantum infrastructure by demonstrating configurations of small-scale quantum networks.