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DTSTART:20250328T113000Z
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LOCATION:Seminar Room
SUMMARY:ICFO | IRÉNÉE FRÉROT 
CLASS:PUBLIC
DESCRIPTION:Exciton-polaritons (EP) are hybrid light-matter quasiparticles 
 that are produced in semiconductor microcavities\, when resonantly pumped 
 by a laser. They may be viewed as driven-dissipative analogues of quantum 
 gases\, where EP play the role of atoms\, interacting via their matter com
 ponent (excitons\, which are bound electron-hole pairs in the semiconducto
 r)\, and being probed through they photonic component. States of matter wh
 ich are analogous to Bose-Einstein condensates may form inside of the micr
 ocavity\, and photons escaping from it are measured. However\, in contrast
  to trapped cold atom systems\, the fact that the system is hosted in a cr
 ystalline solid-state lattice makes it fundamentally coupled to thermal no
 ise. Due to the interactions (non-linearities) inside the EP system\, outg
 oing light shows non-trivial photon correlations\, and possibly quantum en
 tanglement. This is somewhat reminiscent of the phenomenon of spontaneous 
 parametric down conversion studied in quantum optics\, but shows also impo
 rtant differences which are the topic of current investigation. I will pre
 sent a joint theory-experiment effort to understand the nature of photon c
 orrelations produced in such EP systems.  References : https://arxiv.org/a
 bs/2304.08677 [Fr&eacute\;rot et al\, PRX 2023] \; https://arxiv.org/abs/2
 501.07899 [Richard et al\, 2025].&nbsp\;
DTSTAMP:20260405T145334Z
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