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Bruit de grenaille quantique électronique et statistique de photons micro-ondes

Abstract : This work is devoted to the experimental study of quantum electronic shot noise in mesoscopic conductors. In the rst part, we studied high frequency shot noise in a one-dimensional ballistic conductor : a quantum point contact (QPC). We measured, via the transmitted noise power in our detection circuit, the spectral density of noise at nite frequency f, where f belongs to the 4 to 8GHz frequency range, as a function of the bias voltage V applied to the QPC. We showed its singularity for V = hf=e. We have also studied its dependence with the transmission of the QPC and have thus validated, with a limited number of adjustable parameters, the scattering theory applied to the high frequency shot noise of a conductor without interactions. In the second part, we realised a Hanbury-Brown Twiss experiment (intensity interferometry) in order to test the photon statistics radiated in the detection circuit, by the shot noise of a low resistance tunnel junction. We showed that the current uctuations of this conductor with a high number of electronic channels, produced a chaotic light : the f frequency photon population statistics is super-poissonnian, since the power uctuations are proportional to the square of the mean photon power. Eventually, the experimental set-up is bound to test the radiation produced by the shot noise of a QPC, which could have, according to recent theoretical predictions, a non-classical behaviour (sub-poissonnian statistics).
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Contributor : Eva Zakka Bajjani <>
Submitted on : Saturday, June 26, 2010 - 6:08:53 AM
Last modification on : Wednesday, December 9, 2020 - 3:10:45 PM
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  • HAL Id : tel-00495429, version 1


Eva Zakka Bajjani. Bruit de grenaille quantique électronique et statistique de photons micro-ondes. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00495429⟩



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