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master's thesis
Kvantna kriptografija putem optičkog vlakna
Zagreb: University of Zagreb, Faculty of Science, 2024. urn:nbn:hr:217:343785
Cerović, Antonio
University of Zagreb
Faculty of Science
Department of Physics

Institutional repository: Repository of the Faculty of Science

Cite this document

Cerović, A. (2024). Kvantna kriptografija putem optičkog vlakna (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:343785

Cerović, Antonio. "Kvantna kriptografija putem optičkog vlakna." Master's thesis, University of Zagreb, Faculty of Science, 2024. https://urn.nsk.hr/urn:nbn:hr:217:343785

Cerović, Antonio. "Kvantna kriptografija putem optičkog vlakna." Master's thesis, University of Zagreb, Faculty of Science, 2024. https://urn.nsk.hr/urn:nbn:hr:217:343785

Cerović, A. (2024). 'Kvantna kriptografija putem optičkog vlakna', Master's thesis, University of Zagreb, Faculty of Science, accessed 14 July 2024, https://urn.nsk.hr/urn:nbn:hr:217:343785

Cerović A. Kvantna kriptografija putem optičkog vlakna [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2024 [cited 2024 July 14] Available at: https://urn.nsk.hr/urn:nbn:hr:217:343785

A. Cerović, "Kvantna kriptografija putem optičkog vlakna", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:217:343785

Metadata
TitleKvantna kriptografija putem optičkog vlakna
Title (english)Quantum cryptography over an optic fibre
AuthorAntonio Cerović
MentorMario Stipčević (mentor)
MentorHrvoje Buljan (komentor)
Committee memberHrvoje Buljan (predsjednik povjerenstva)
Committee memberMario Stipčević (član povjerenstva)
Committee memberMiroslav Požek (član povjerenstva)
Committee memberMarinko Jablan (član povjerenstva)
Committee memberMihael Srđan Grbić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Physics)
Zagreb
Defense date and country2024-04-04, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Physics
Abstract
U današnjem svijetu tehnologije, razvoj kvantnih računala predstavlja prijetnju sadašnjim kriptografskim sustavima. Naime, pomoću Shorovog algoritma, koji bi se u budućnosti mogao izvoditi na kvantnim računalima, moguće je razbiti kriptografske algoritme koji su trenutačno u upotrebi. Kao moguće rješenje problema nameće se kvantna distribucija ključa. Kvantna distribucija ključa služi za dijeljenje tajnog ključa u simetričnoj kriptografiji, a sigurnost iste temelji se na zakonima kvantne fizike. U ovom radu predstavljena je eksperimentalna kvantna distribucija ključa putem konvencionalnog G.652.D telekomunikacijskog optičkog vlakna. Implementacija se temelji na BB84 protokolu i koristi polarizacijska stanja fotona valne duljine 810nm za prijenos informacije. Za razliku od uobičajenih skupih rješenja, u ovom radu korištene su relativno jeftine optičke komponente za spomenutu valnu duljinu te detektori bazirani na SPAD ćelijama. Dodatno, u našem pristupu pošiljatelj i primatelj ne trebaju imati sinkronizirane satove niti sinkronizirajući signal, već se poravnavanje vrši minimiziranjem udjela pogrešaka. Protokol je uspješno proveden za gubitke do 8.3 dB, što odgovara duljini od 2.7 km G.652.D optičkog vlakna. Također, napravljena je analiza eksperimentalnog postava te ustanovljena učinkovitost provedene kvantne distribucije ključa.
Abstract (english)
In today’s world of technology, the development of quantum computers poses a threat to current cryptographic systems. Specifically, with Shor’s algorithm, which could be executed on future quantum computers, it becomes possible to break cryptographic algorithms currently in use. As a possible solution to this problem, quantum key distribution emerges. Quantum key distribution is used for sharing a secret key in symmetric cryptography, and its security is based on the laws of quantum physics.This paper presents experimental quantum key distribution via conventional G.652.D telecommunications optical fiber. The implementation is based on the BB84 protocol and utilizes polarization states of photons with a wavelength of 810 nm for information transmission. Unlike conventional, expensive solutions, this setup uses relatively inexpensive optical components for this wavelength and detectors based on SPAD cells. In our approach, the sender and receiver do not need synchronized clocks or a synchronizing signal; alignment is achieved by minimizing error rates. The protocol was successfully implemented for losses up to 8.3 dB, corresponding to a length of2.7 km of G.652.D optical fiber. Furthermore, an analysis of the experimental setup was conducted, and the effectiveness of the implemented quantum key distribution was established.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:343785
ProjectNumber: KK.01.1.1.01.0001
Title: Potpora vrhunskim istraživanjima Centra izvrstnosti za napredne materijale i senzore (CEMS)
Title: Support for Center of Excellence for Advanced Materials and Sensing Devices cutting-edge research
Acronym: CEMS
Leader: Marko Kralj
Jurisdiction: eu
Funder: Europska komisija
Funding stream: European Regional Development Fund
Study programmeTitle: The University Integrated Undergraduate and Graduate Programme in Physics; Research Physics; specializations in: Research Physics
Course: Research Physics
Study programme type: university
Study level: integrated undergraduate and graduate
Academic / professional title: sveučilišni magistar fizike (sveučilišni magistar fizike)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2024-06-03 10:18:44