Théorie de la manipulation ultra-rapide d'états quantiques corrélés en nanoélectronique

par Corentin Bertrand

Projet de thèse en Physique Théorique

Sous la direction de Xavier (phys) Waintal et de Christoph Groth.

Thèses en préparation à Grenoble Alpes , dans le cadre de Physique , en partenariat avec PHotonique, ELectronique et Ingéniérie QuantiqueS (laboratoire) depuis le 28-10-2016 .


  • Résumé

    This PhD project lies at the intersection of two fields: many-body quantum physics, and quantum nanoelectronics. The former field studies correlations between particles in interacting systems. This remains one of the major challenges of contemporary theoretical physics, with applications ranging from the calculation of the proton mass to high-temperature superconductivity. To help addressing related problems, our group has developed new quantum Monte-Carlo techniques that closely follow the calculations that are usually performed analytically. The latter field, quantum nanoelectronics, serves as a natural test-bed for engineering various exotic quasi-particles (for instance the so-called Majorana fermions – particles that are their own anti-particles). Here again, our group has developed numerical tools to study and design such quantum systems (http://kwant-project.org/). During this PhD project, we will focus on the new physics that emerges when nanoelectronics devices are manipulated with ultra-fast pulses (at frequencies in the GHz to THz range). When the driving frequencies become large, correlations become important and new physics appears – a bit like in particle accelerators where accessing new energies unlocks new elementary particles such as the Higgs boson. Experimentally, this physics is now reaching the labs and could provide new paradigms for quantum computation. The research work will involve theoretical / formalism aspects (out-of-equilibrium Feynman diagrams), numerics (using modern approaches based on Python) and the modeling of concrete physical systems (including semi-conductors and/or superconductors).

  • Titre traduit

    Theory of ultra-fast quantum manipulation and correlations in nanoelectronics


  • Résumé

    This PhD project lies at the intersection of two fields: many-body quantum physics, and quantum nanoelectronics. The former field studies correlations between particles in interacting systems. This remains one of the major challenges of contemporary theoretical physics, with applications ranging from the calculation of the proton mass to high-temperature superconductivity. To help addressing related problems, our group has developed new quantum Monte-Carlo techniques that closely follow the calculations that are usually performed analytically. The latter field, quantum nanoelectronics, serves as a natural test-bed for engineering various exotic quasi-particles (for instance the so-called Majorana fermions – particles that are their own anti-particles). Here again, our group has developed numerical tools to study and design such quantum systems (http://kwant-project.org/). During this PhD project, we will focus on the new physics that emerges when nanoelectronics devices are manipulated with ultra-fast pulses (at frequencies in the GHz to THz range). When the driving frequencies become large, correlations become important and new physics appears – a bit like in particle accelerators where accessing new energies unlocks new elementary particles such as the Higgs boson. Experimentally, this physics is now reaching the labs and could provide new paradigms for quantum computation. The research work will involve theoretical / formalism aspects (out-of-equilibrium Feynman diagrams), numerics (using modern approaches based on Python) and the modeling of concrete physical systems (including semi-conductors and/or superconductors).