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Quantum entanglement generation with photons
Smith, Andre. 2024. Quantum entanglement generation with photons. Unpublished masters dissertation. Stellenbosch : Stellenbosch University [online]. Available: https://scholar.sun.ac.za/handle/10019.1/131914 Thesis (MSc)--Stellenbosch University, 2024.
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Stellenbosch : Stellenbosch University
2025
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| _version_ | 1867613908051689472 |
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| access_status_str | Open Access |
| author | Smith, Andre |
| author2 | Tame, M. S. |
| author_browse | Smith, Andre Tame, M. S. |
| author_facet | Tame, M. S. Smith, Andre |
| author_sort | Smith, Andre |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Smith, Andre. 2024. Quantum entanglement generation with photons. Unpublished masters dissertation. Stellenbosch : Stellenbosch University [online]. Available: https://scholar.sun.ac.za/handle/10019.1/131914
Thesis (MSc)--Stellenbosch University, 2024. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/131914 |
| institution | Stellenbosch University (South Africa) |
| last_indexed | 2026-06-10T12:43:36.943Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/131914 Quantum entanglement generation with photons Smith, Andre Tame, M. S. Steenkamp, Christine M. Stellenbosch University. Faculty of Science. Dept. of Physics. Photons -- Measurement Quantum theory Quantum entanglement Physical optics UCTD Smith, Andre. 2024. Quantum entanglement generation with photons. Unpublished masters dissertation. Stellenbosch : Stellenbosch University [online]. Available: https://scholar.sun.ac.za/handle/10019.1/131914 Thesis (MSc)--Stellenbosch University, 2024. ENGLISH ABSTRACT: Path entanglement is an essential resource in photonic quantum information protocols, including in quantum communication, quantum computing and quantum sensing. We study the generation and characterisation of path entangled photon states. First we use pairs of single photons generated by spontaneous parametric down–conversion. Path entanglement is generated using linear optics components. A set of measurements are performed to characterise the photons being generated and determine whether entanglement is present. We measure the second-order correlation, visibility and use the concurrence as a measure of entanglement. This method is shown to be effective for generating path entanglement using spontaneous parametric down–conversion. The knowledge gained from the above study is then transferred to a setup using an excited nitrogen–vacancy centre within a nanodiamond as a single–photon source. Once again linear optics components are used to generate path entanglement. A set of measurements is performed to characterise the photons generated and determine whether entanglement is present. We measure the spectrum, second-order correlation, lifetime and use the concurrence as a measure of entanglement. The experiment is performed using continuous-wave laser excitation with a state generation window imposed. This method of en tanglement generation is unique as it does not require a pulsed laser source for photon generation resulting in the absence of a heralding signal which is overcome through the use of the state-generation window. AFRIKAANSE OPSOMMING: Padverstrengeling is ’n noodsaaklike hulpbron in fotoniese kwantuminligting- protokolle, insluitend in kwantumkommunikasie, kwantumrekenaars en kwan- tumwaarneming. Ons bestudeer die generering en karakterisering van padver- strengelde fotontoestande. Aanvanklik maak ons gebruik van pare enkelfotone wat deur spontane parametriese af-omskakeling gegenereer word. Padverstren- geling word gegenereer deur gebruik te maak van lineêre optiese komponente. ’n Stel metings word uitgevoer om die fotone wat gegenereer word te karakte- riseer en te bepaal of verstrengeling teenwoordig is. Ons meet die tweede-orde korrelasie, sigbaarheid en gebruik die konkurrensie as ’n maatstaf van verstren- geling. Daar word getoon dat hierdie metode effektief is om padverstrengeling te genereer deur spontane parametriese afwaartse-omskakeling te gebruik. Die kennis van die bogedoende studie word dan oorgedra na ’n opstelling deur gebruik te maak van ’n opgewekte stikstof–leemte binne ’n nanodiamant as ’n enkelfotonbron. Weereens word daar gebruik gemaak van lineêre op- tiese komponente om padverstrengeling te gegenereer. ’n Stel metings word uitgevoer om die fotone wat gegenereer word te karakteriseer en te bepaal of verstrengeling teenwoordig is. Ons meet die spektrum, tweede-orde korrela- sie, leeftyd en gebruik die konkurrensie as ’n maatstaf van verstrengeling. Die eksperiment word uitgevoer met behulp van kontinue laser opwekking met ’n toestandgenerasie-venster opgelê. Hierdie metode van verstrengeling genere- ring is uniek deurdat dit nie gebruik maak van ’n gepulseerde laserbron vir die fotongenerering nie wat lei tot die afwesigheid van ’n aankondigingsein wat oorkom word deur die gebruik van die toestandgenerasie-venster. Masters 2025-04-09T09:20:59Z 2025-04-09T09:20:59Z 2024-12 Thesis https://scholar.sun.ac.za/handle/10019.1/131914 Stellenbosch University xi, 55 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Photons -- Measurement Quantum theory Quantum entanglement Physical optics UCTD Smith, Andre Quantum entanglement generation with photons |
| title | Quantum entanglement generation with photons |
| title_full | Quantum entanglement generation with photons |
| title_fullStr | Quantum entanglement generation with photons |
| title_full_unstemmed | Quantum entanglement generation with photons |
| title_short | Quantum entanglement generation with photons |
| title_sort | quantum entanglement generation with photons |
| topic | Photons -- Measurement Quantum theory Quantum entanglement Physical optics UCTD |
| url | https://scholar.sun.ac.za/handle/10019.1/131914 |
| work_keys_str_mv | AT smithandre quantumentanglementgenerationwithphotons |