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UID:0-713@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20191126T110000
DTEND;TZID=Europe/Paris:20191126T120000
DTSTAMP:20191115T152118Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-alexandra-sheremet/
SUMMARY:Séminaire du LPTMS: Alexandra Sheremet - Salle des séminaires du 
 FAST et du LPTMS\, bâtiment Pascal n°530 - 26 Nov 19 11:00
DESCRIPTION:Light-matter interface based on collective and cooperative effe
 cts\nAlexandra Sheremet (Institut Langevin\, ESPCI)\n\nUnderstanding and c
 ontrol of light-matter interactions have been central to the development o
 f modern physics. A promising approach for study of such interactions is b
 ased on ensemble of neutral atoms. Manipulations with density and spatial 
 organization of atoms in a system can bring fascinating results\, which ar
 e interesting for quantum information applications. For example\, reducing
  average distance between atoms up to resonant wavelength induces dipole-d
 ipole interaction and results in cooperative effects. These effects in spa
 tially dense atomic ensembles can modify optical properties of the system.
  Moreover\, spatial organization of atoms in ordered arrays and optical la
 ttices causes a manifestation of collective effects. In such systems\, lon
 g-range spatial order brings dramatic consequences for the light propagati
 on.\n\nCollective and cooperative effects manifistable in an atomic ensemb
 le could provide essential enhancement of the coupling strength between th
 e light and atomic systems. Moreover\, recent experimental advances in the
  trapping technique have made it possible to create 1D\, 2D or 3D spatiall
 y ordered atomic configurations\, where the collective effects play a very
  important role. In addition\, the interaction between light and atoms can
  be enhanced by trapping atoms in the vicinity of a nanoscale waveguide du
 e to strong confinement of the light.\n\nIn this talk\, I will discuss lig
 ht propagation in an atomic ensemble where average distance between atoms 
 is comparable with the resonant wavelength. I will consider the light prop
 agation in both free space and trapped near a nanofiber surface atomic ens
 embles. The light scattering in such dense atomic configuration is describ
 ed in terms of microscopic approach based on the standard scattering matri
 x and resolvent operator formalism. We show theoretically and experimental
 ly that spatially dense atomic ensembles allow obtaining effective light-m
 atter interface and reliable light storage with essentially fewer atoms th
 an it can be achieved in dilute gases. Furthermore\, we show that the pres
 ence of an optical nanofiber modifies the character of atomic interaction 
 and results in long-range dipole-dipole coupling between atoms not only vi
 a the free space\, but also through the waveguide mode.
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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DTSTART:20191027T020000
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