Eksperimentalna kvantna kriptografija

master's thesis

• Title (english): Experimental Quantum Cryptography
• Author: Sabina Špoljar
• Mentor: Mario Stipčević (mentor)
• Mentor: Hrvoje Buljan (komentor)
• Committee member: Hrvoje Buljan (predsjednik povjerenstva)
• Committee member: Mario Stipčević (član povjerenstva)
• Committee member: Željko Skoko (član povjerenstva)
• Committee member: Maja Planinić (član povjerenstva)
• Committee member: Marinko Jablan (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2024-07-10, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

Razvoj kvantnih računala predstavlja veliku opasnost za sigurnost komunikacije putem interneta, koja trenutno počiva na vremenski zahtjevnom probijanju algoritama za njenu uspostavu. Kada bi postojalo dovoljno jako kvantno računalo, spomenuti algoritmi bi se dokazano mogli probiti izvršavanjem tzv. Shorovog algoritma na navedenom računalu. Zbog tog velikog problema počelo se razmišljati o novim načinima ostvarivanja sigurne komunikacije te se Kvantna Distribucija Ključa pojavila kao jedno od mogućih rješenja. U ovom radu predstavljena je eksperimentalna kvantna distribucija ključa bazirana na BB84 protokolu te pripadajući fizikalni postav. U svrhu implementacije protokola korišteni su, izmedu ostalog, izvori fotona valne duljine 810 nm, SPAD detektori i telekomunikacijsko G.652.D optičko vlakno. Korištenjem ovih komponenti pokazano je kako se telekomunikacijsko vlakno i SPAD detektori mogu uspješno koristiti za provedbu kvantne distribucije ključa na manjim udaljenostima, što otvara mogućnost uspostave jeftinije implementacije protokola u budućnosti. Protokol je uspješno proveden za gušenje do 8.3 dB, što odgovara duljini od 2.7 km optičkog vlakna. Protokol i rezultati takoder su predstavljeni i u članku “Near Infrared Devices and Protocols for Short Distance Quantum Key Distribution via Telecom Fibers” na hibridnoj medunarodnoj konferenciji MIPRO te će isti biti dostupan u IEEE Xplore databazi.

Abstract (english)

The development of quantum computers poses a significant threat to today’s communication security, since it currently relies solely on the time-consuming process of breaking algorithms used for its establishment. However, in the advent of sufficiently powerful quantum computers, these algorithms could be effectively broken by executing the so-called Shor’s algorithm on the forementioned computer, which would undermine communication security as a whole. Due to this major challenge, new approaches for achieving secure communication have begun to be considered. One potential solution is Quantum Key Distribution (QKD). Therefore, this paper presents an experimental quantum key distribution system based on the BB84 protocol and its corresponding physical setup. For protocol implementation, components such as 810 nm wavelength photon sources, single-photon avalanche diode (SPAD) detectors, and G.652.D telecommunication optical fiber were utilized. It is demonstrated how telecommunication fiber and SPAD detectors can be successfully employed for quantum key distribution over short distances, thus opening the possibility of a more cost-effective protocol implementation in the future. The protocol was successfully implemented for attenuation up to 8.3 dB, corresponding to the length of 2.7 km of optical fiber. The protocol and results mentioned in this summary were also presented in an article titled “Near Infrared Devices and Protocols for Short Distance Quantum Key Distribution via Telecom Fibers” at MIPRO hybrid international convention and will be available in the IEEE Xplore database.

• Keywords: kvantna distribucija ključa; kvantna kriptografija; BB84 protokol
• Keywords (english): quantum key distribution; quantum cryptography; BB84 protocol
• Language: croatian
• URN:NBN: urn:nbn:hr:217:983693
• Study programme: Title: The University Integrated Undergraduate and Graduate Programme in Physics Education; specializations in: Physics Education; Course: Physics Education; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: sveučilišni magistar edukacije fizike (sveučilišni magistar edukacije fizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-07-26 10:42:19