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GENERATION DE PHOTONS UNIQUES INDISCERNABLES PAR UNE BOITE QUANTIQUE SEMI-CONDUCTRICE DANS UNE MICROCAVITE OPTIQUE

Abstract : One of the main scientific achievement of the last century is certainly the development of quantum mechanics. Recently, computer scientists and engineers teamed with physical scientists to further our understanding of quantum phenomena, and to exploit this understanding to realize new devices with novel functionality for communication and computing, that can be directly engineered using correlations between quantum states, giving rise to a new field in physics : Quantum information science. These quantum states can be indistinguishable single photons. Our work aimed at the generation of such quantum states, from sefl-assembled quantum dots. These emitters can produce single photons on demand but the indistinguishability between photons is rapidly destroyed by decoeherence processes in the solid-state. In order to restore the indistinguishability between photons, the dot is coupled to the mode of a micropilar cavity, that accelerates its spontaneous emission rate by a factor 25, so that the photons are emitted before being “marked” by dephasing mechanisms. This acceleration leads to the generation of indistinguishable single photons with a degree of indistinguishability as high as 75%. In this context, two-photon interference phenomena occur, whereby two single photons entering the two input ports of a beamsplitter, emerge from the beamsplitter both in the same output port, as if they had "coalesced" into a two-photon state
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https://tel.archives-ouvertes.fr/tel-00011534
Contributor : Spyros Varoutsis <>
Submitted on : Friday, February 3, 2006 - 5:07:59 PM
Last modification on : Monday, October 19, 2020 - 11:04:22 AM
Long-term archiving on: : Saturday, April 3, 2010 - 10:08:31 PM

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  • HAL Id : tel-00011534, version 1

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Spyros Varoutsis. GENERATION DE PHOTONS UNIQUES INDISCERNABLES PAR UNE BOITE QUANTIQUE SEMI-CONDUCTRICE DANS UNE MICROCAVITE OPTIQUE. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00011534⟩

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