ETD system

Electronic theses and dissertations repository

 

Tesi etd-03072013-134218


Thesis type
Tesi di dottorato di ricerca
Author
HUILLERY, PAUL
email address
paul.huillery@gmail.com
URN
etd-03072013-134218
Title
Few and Many-body Physics in cold Rydberg Gases
Settore scientifico disciplinare
FIS/03
Corso di studi
SCIENZE DI BASE
Commissione
tutor Prof. Arimondo, Ennio
tutor Dott. Comparat, Daniel
Parole chiave
  • Sub-poissonian Statistics
  • Rydberg atoms
  • Quantum correlation
  • Interactions
  • Many-body
  • Few-body
  • Dicke collective states
  • Cooperative effects
  • Collective excitation
  • Cold gases
  • 4-body process
Data inizio appello
12/03/2013;
Consultabilità
completa
Riassunto analitico
During this thesis, the Physics of interacting systems has been investigated experimentally using Cold Rydberg gases. Rydberg atoms are very excited atoms and have the particularity to interact strongly together through long-range electrostatic interaction. A first highlight of the thesis is a direct experimental observation of a 4-body process. This process consists in internal exchanges of excitations between 4 Rydberg atoms due to their mutual interactions. In addition to its experimental observation, the process has been succefully described theoretically at a quantum level. A second highlight of this thesis has concerns the study of the laser excitation of strongly interacting Rydberg gases. In this regime, many-body quantum correlations play a central role leading to fascinating many-body behavior. In addition to fundamental interests, such systems could be used to implement quantum simulator or non-classical light sources. The system has been investigated during this thesis through the counting statistics of the Rydberg excitation. A highly sub-poisonian, i.e correlated, statistics has been observed in the regim of strong interactions proving the many-body nature of the system. A third highlight of this thesis is the development of an original theoretical model to describe the laser excitation of strongly interacting Rydberg gases. Using the so-called Dicke collective states, it has been possible to catch several interesting features of this many-body problem.
File