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Bruit quantique électronique et photons micro-ondes

Abstract : This work is devoted to the experimental study of quantum electronic noise in mesoscopic conductors. In the first part of this thesis, we studied shot noise in a one-dimensional ballistic conductor: a quantum point contact (QPC). We showed experimentally that, when one of the QPC contacts is irradiated with microwave photons, we observe partition noise in the absence of net current flowing through the sample. Thus, we validate the scattering theory of photo-assisted shot noise first by measuring the Fano factor without bias voltage across the conductor, and then by measuring shot noise in the doubly non equilibrium situation, where both a bias voltage and a microwave modulation are applied. In the second part, we realized the first tests of a new experimental set-up which will be able to measure high frequency noise of a mesoscopic conductor and the photon statistics emitted by this conductor in the measurement circuit. These tests consist in realizing Hanbury-Brown and Twiss type experiments (intensity interferometry) with two kinds of microwave photon source. First, we used a thermal incoherent source (macroscopic 50 Ohms resistor). It showed super-Poissonian noise, since the power fluctuations are proportional to the square of the mean photon power. Secondly, we studied a classical monochromatic source, which shows a Poissonian statistics. The giant Fano factor measured is perfectly explained by the attenuator and amplifier noise
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Submitted on : Tuesday, July 29, 2003 - 12:18:04 PM
Last modification on : Friday, March 5, 2021 - 3:12:04 PM
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  • HAL Id : tel-00003204, version 1


Laure-Hélène Bize-Reydellet. Bruit quantique électronique et photons micro-ondes. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2003. Français. ⟨tel-00003204⟩



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