Parametric frequency conversion processes in ultra-cold atomic vapors

• Grant number: 06/05332-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): January 01, 2007
• Effective date (End): December 31, 2007
• Field of knowledge: Physical Sciences and Mathematics - Physics
• Principal Investigator: Celso Jorge Villas-Bôas
• Grantee: Fabricio Ramos Silva
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

In this project it will be studied the generation of non-linear processes, for radiation fields, in ultracold atomic vapors, in particular the generation of frequency-conversion processes, useful for the generation of entangled states (for example the two-mode vacuum squeezed states) and squeezed states of the radiation field. The generation of such processes was recently investigated in the context of cavity quantum electrodynamics (QED) where it was theoretically shown how it is possible to get them using the interaction between three-level atoms, driven by laser fields, and modes of the radiation field trapped in a high quality cavity. Therefore, in the present work it will be investigated the transposition of these schemes, previously studied in the cavity QED domain, to the ultracold atomic vapor context, making use of the eletromagneticamente induced transparency (EIT) phenomenon, where the group velocity of the radiation fields can be extremely reduced. In this way, the interaction time between different modes of the radiation field can be increased sufficiently to get high degrees of squeezing or entanglement of the propagating fields.