Two-Photon Excitation of a GaAs Quantum Dot by Electro-Optically Modulating a Continuous Wave Laser

One of the most important steps towards enabling quantum communication would be to successfully integrate single-photon emitters and quantum memories, enabling the development of quantum repeaters. This is why, as part of a larger project, the objective of this bachelor thesis was to retrieve single...

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Bibliographic Details
Main Authors: Schauman, Julia, Bendrot, Linnea
Format: Others
Language:English
Published: KTH, Skolan för teknikvetenskap (SCI) 2020
Subjects:
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-275736
Description
Summary:One of the most important steps towards enabling quantum communication would be to successfully integrate single-photon emitters and quantum memories, enabling the development of quantum repeaters. This is why, as part of a larger project, the objective of this bachelor thesis was to retrieve single-photons suitable for storage inside a Rubidium-based quantum memory. In this report, we show how a gallium arsenide quantum dot was successfully excited with two-photon excitation by using a pulsed laser, where the pulses were obtained by electro-optically modulating a continuous wave laser. While getting enough power from the pulsed excitation laser to reach the π-pulse for the quantum dot excitation, a g^(2)(0)-value of 0.048976±0.000831 was measured. This proves that it is possible to achieve high quality single-photon emission from a quantum dot, while using a electro-optically modulated continuous wave laser. === En nyckelkomponent i utvecklingen av kvantkommunikation är integrationen av enskilda fotoner och kvantminnen, något som skulle möjliggöra utveckligen av kvantrepeterare. Som del av ett större forskningsprojekt var målet med detta kandidatarbete att producera enskilda fotoner som framgångsrikt skulle kunna lagras i ett rubidium baserat kvantminne. Vi presenterar i denna rapport hur en kvantprick av galliumarsenid framgångsrikt kan exciteras av en laser som pulsats genom elektrooptisk modulering av en kontinuerlig laser. När effekten hos excitations lasern är tillräckligt hög för π-puls-excitation av kvantpricken erhålls ett g^(2)(0)-värde på 0.048976±0.000831. Det visar på möjligheten att uppnå högkvalitativa enskilda fotoner från en kvantprick som exciteras av en elektrooptiskt modulerad kontinuerlig laser.