Année 2016

Experimental setup for fast loading of a miniaturized cavity: toward an atomic qubits register

Claire Lebouteiller (LKB)

The study of quantum entanglement is a very active research field. Cavity quantum electrodynamics systems are versatile tools allowing for instance entanglement in mesoscopic systems, that is to say with about a hundred particles. The purpose of (...) | ↦ Read more

The two dimensional Bose gas in box potentials

Laura Corman (LKB)

Degenerate atomic gases are a versatile tool to study many-body physics. They offer the possibility to explore low-dimension physics, which strongly differs from the three dimensional (3D) case due to the enhanced role of fluctuations. In this (...) | ↦ Read more

Analytical methods and field theory for disordered systems

Thimothée Thiery (LPT)

Analytical methods and field theory for disordered systems Thimothée This thesis presents several aspects of the physics of disordered elastic systems and of the analytical methods used for their study. On one hand we will be interested at (...) | ↦ Read more

Wetting on surfaces that are disordered at the nanometer scale

Romain Lhermerout (LPS)

Wetting is the study of the spreading of a liquid on a solid surface. This phenomenon is ubiquitous in everyday life, and its control has major industrial implications, from the cooling of reactors to microelectronics and nanofluidics. Despite (...) | ↦ Read more

Microwaves as a probe of quantum dot circuits : from Kondo dynamics to mesoscopic quantum electrodynamics

Laure Bruhat (LPA)

This thesis uses microwaves as probe of carbon nanotube quantum dot circuits. In a first experiment, a microwave excitation is directly applied to a circuit electrode for a quantum dot in the Kondo regime. We provide the first (...) | ↦ Read more

Stochastic interacting systems in biophysics: immunology and development

Jonathan Desponds (LPT)

This work presents two problems of biology requiring data analysis and models from statistical mechanics: population dynamics in immunology and gene regulation in embryo development. In immunology I study the problem of somatic evolution in the (...) | ↦ Read more

Mixtures of superfluids

Marion Delehaye (LKB)

Ultracold atoms are unique tools to probe the physics of quantum matter. Indeed, the high degree of tunability of ultracold Bose and Fermi gases makes them ideal systems for quantum simulation and for exploring macroscopic manifestations of (...) | ↦ Read more

Towards a squeezing-enhanced atomic clock on a chip

Konstantin Ott (LKB)

This thesis describes the conception and construction of an “entanglement-enhanced” trapped atom clock on an atom chip (TACC). The key feature of this new experiment is the integration of two optical Fabry-Pérot micro resonators which enable (...) | ↦ Read more

Spectral inference methods on sparse graphs

Alaa Saade (LPS)

In an era of unprecedented deluge of (mostly unstructured) data, graphs are proving more and more useful, across the sciences, as a flexible abstraction to capture complex relationships between complex objects. One of the main challenges arising (...) | ↦ Read more

Theory of high-dimensional liquids and glasses

Thibaud Maimbourg (LPT)

The dynamics of liquids, regarded as strongly-interacting classical particle systems, remains a field where theoretical descriptions are limited. So far, there is no microscopic theory starting from first principles and using controlled (...) | ↦ Read more

High-dimensional inference with correlated data: statistical modeling of protein sequences beyond structural prediction

Alice Coucke (LPT)

Over the last decades, genomic databases have grown exponentially in size thanks to the constant progress of modern DNA sequencing. A large variety of statistical tools have been developed, at the interface between bioinformatics, machine (...) | ↦ Read more

Analysis and control of polarization effects in structured semiconductor microcavities

Ombline Lafont (LPA)

Semiconductor microcavities with embedded quantum wells in the strong light-matter coupling regime host quasi-particles called microcavity exciton-polaritons. Their hybrid nature, half-electronic, half-photonic, brings about remarkable nonlinear (...) | ↦ Read more

Irreversible Markov chains by the factorized Metropolis filter: Algorithms and applications in particle systems and spin models

Manon Michel (LPS)

Monte Carlo methods, by sampling high-dimensional integrals through random walks, have revolutionized the understanding of complex systems. The traditional Metropolis local random walks induce however a high rate of rejections, making any (...) | ↦ Read more

DNA denaturation: a phase transition with disorder

Martin Retaux (LPS)

This thesis is a study of a DNA denaturation model, introduced by Poland and Scheraga during the 1960s. The depinning models with random environment, with which the similarity has been made, are also concerned. If the interactions between the (...) | ↦ Read more

Ultrafast THz pulse generation from quantum cascade laser

Feihu WANG (LPA)

In the THz frequency range, a semiconductor based technology platform for intense and ultrashort pulse generation has yet to be realised. THz quantum cascade lasers (QCLs) are foundational semiconductor devices for laser action in the THz range (...) | ↦ Read more

Stochastic processes and disordered systems, around Brownian motion

Mathieu Delorme (LPT)

In this thesis, we study stochastic processes appearing in different areas of statistical physics: Firstly, fractional Brownian motion is a generalization of the well-known Brownian motion to include memory. Memory effects appear for example (...) | ↦ Read more

Exploring quantum circuits with a cQED architecture : application to compressibility measurements

Matthieu Desjardins (LPA)

Quantum dot circuits represent model systems for the study of strong electronic correlations, epitomized by the Kondo effect. In this thesis, we use light-matter interaction to study an internal degree of (...) | ↦ Read more

Cooling a macroscopic mechanical oscillator close to its quantum ground state

Leonhard Neuhaus (LKB)

In this work, we attempt the experimental demonstration of quantum effects in the motion of a macroscopic mechanical resonator with a mass of 33 micrograms, about 3 orders of magnitude above the mass of the heaviest system demonstrated so far in (...) | ↦ Read more