Quantitative relations between Bell non-locality and Quantum Key Distribution

Παπαδοπούλου, Ηρώ

dc.contributor.author	Παπαδοπούλου, Ηρώ
dc.date.accessioned	2025-04-16T10:29:58Z
dc.date.available	2025-04-16T10:29:58Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/61767
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.29463
dc.rights	Default License
dc.subject	Bell non-locality	en
dc.subject	Quantum Key Distribution	en
dc.subject	Non locality measures	el
dc.title	Quantitative relations between Bell non-locality and Quantum Key Distribution	en
dc.contributor.department	Φυσική και Τεχνολογικές Εφαρμογές	el
heal.type	masterThesis
heal.classification	Κβαντική πληροφορία	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2025-03-14
heal.abstract	This thesis investigates the quantitative relationships between Bell nonlocality—a hallmark of quantum entanglement—and the security potential within device-independent quantum key distribution (DI-QKD). DI-QKD is a protocol in quantum cryptography that enables secure communication without trusting the underlying devices, making it reliant solely on the principles of quantum mechanics. The study begins by establishing foundational concepts, including quantum entanglement, Bell’s theorem, and the critical role of nonlocal correlations in ensuring secure key distribution. A major focus is placed on understanding how varying degrees of Bell inequality violations affect DI-QKD, particularly examining whether minimal nonlocality levels suffice for cryptographic security. By exploring methods for quantifying nonlocality and introducing novel interpretations, the thesis demonstrates that even small amounts of nonlocality can be sufficient for secure key generation. Additionally, a new metric for nonlocality is proposed, potentially enhancing the precision of security assessments in DI-QKD. This work thus provides insights into the entanglement requirements of secure quantum communication, expanding the theoretical framework of DI-QKD and its applicability to real-world cryptographic protocols.	en
heal.advisorName	Διαμαντή, Ελένη
heal.advisorName	Supic, Ivan
heal.advisorName	Βαρελογιάννης, Γεώργιος
heal.committeeMemberName	Διαμαντή, Ελένη
heal.committeeMemberName	Βαρελογιάννης, Γεώργιος
heal.committeeMemberName	Αβραμόπουλος, Ηρακλής
heal.academicPublisher	Σχολή Εφαρμοσμένων Μαθηματικών και Φυσικών Επιστημών	el
heal.academicPublisherID	ntua
heal.numberOfPages	28
heal.fullTextAvailability	false