Skip to Main content Skip to Navigation
Theses

Propagation de lumière dans l'hélium métastable : stockage, amplification, fluctuations et bruit quantique.

Abstract : A quantum state of light is characterized by its statistics of number of photons. These statistics can change in the presence of coherent phenomena. This PhD focuses both experimentally and theoretically on the propagation of quantum states within a room temperature vapor of metastable helium. First, we show that ultranarrow coherent population oscillations allow to efficiently store a specific quadrature of a light wave. Nevertheless, this protocol cannot be use to store the two quadratures of a light field. Indeed, the propagation conditions deteriorates its statistical properties, forbidding its use for quantum application. Secondly, we show that it is possible to generate twomode squeezed states of light in that system. High amplification can be achieved (9 dB), exploiting the strong nonlinearities enabled by coherent population trapping of a transition, and because of the energy level structure. Finally, we study atomic spin noise transfer to light polarization noise via Faraday effect. These fluctuations, probed by spin noise spectroscopy, show original behaviors that may be useful in another systems.
Document type :
Theses
Complete list of metadatas

Cited literature [200 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02397341
Contributor : Abes Star :  Contact
Submitted on : Friday, December 6, 2019 - 2:57:14 PM
Last modification on : Tuesday, September 29, 2020 - 7:02:11 AM
Long-term archiving on: : Saturday, March 7, 2020 - 5:28:00 PM

File

79035_NEVEU_2019_archivage.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02397341, version 1

Collections

Citation

Pascal Neveu. Propagation de lumière dans l'hélium métastable : stockage, amplification, fluctuations et bruit quantique.. Physique Quantique [quant-ph]. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLN044⟩. ⟨tel-02397341⟩

Share

Metrics

Record views

338

Files downloads

251