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Towards the generation of entangled sources from single quantum dots in photonic crystal cavities

Abstract : This PhD studies how to generate from unique quantum dots (QD), two kinds of sources of entangled photon pairs: the entangled property is the polarisation of the two photons emitted in the biexcitonic radiative cascade, or is the emission date of two indistinguishable photons. The degree of entanglement is calculated to quantitatively evaluate the impact of the excitonic splitting, the spin flip, and the interaction of the exciton with its surroundings. In both cases the entanglement can be restored by an acceleration of the excitonic radiative life-time with the Purcell effect. A photonic crystal cavity etched on a suspended membrane (CP2D) with the QD embedded within, is an appropriate mean to do so. The CP2D also allows good collection efficiency. The technological requirements to align the QD with the cavity are also studied. The cavity effects are yet insufficient to correct the splitting, which can be reduced with a tuneable vertical electric field. This has been experimentally checked with the process development of PIN diodes compatible with CP2D.
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https://tel.archives-ouvertes.fr/tel-00431849
Contributor : Matthieu Larqué <>
Submitted on : Friday, November 13, 2009 - 12:11:59 PM
Last modification on : Monday, December 14, 2020 - 9:53:00 AM
Long-term archiving on: : Saturday, November 26, 2016 - 2:08:45 PM

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  • HAL Id : tel-00431849, version 1

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Matthieu Larqué. Towards the generation of entangled sources from single quantum dots in photonic crystal cavities. Atomic Physics [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2009. English. ⟨tel-00431849⟩

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