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UID:69e80af54e365
DTSTART:20260424T120000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20260424T130000Z
LOCATION:Blue Lecture Room 
SUMMARY:ICFO | LUKAS WANGLER 
CLASS:PUBLIC
DESCRIPTION:When quantum emitters couple indistinguishably to light\, they 
 can synchronize into a collec tive light&ndash\;matter system with radiati
 ve properties profoundly different from those of independent particles. To
  date\, the resulting collective effects have largely been confined to poi
 nt-like or homogeneous ensembles. Here\, we open access to a qualitatively
  new collective regime by realizing geometrically ordered\, spatially exte
 nded atom arrays with subwavelength spacing. This establishes a fundamenta
 lly new platform in which collective emission is no longer confined to a s
 ingle Dicke mode but instead emerges from a ordered network of photon-medi
 ated interactions. We find that 2D atom arrays undergo strong super and su
 bradiant emission. Despite subwavelength spacing\, we achieve site-resolve
 d imaging and directly observe the build-up of spatial correlations\, demo
 nstrating the transformation of cooperative decay into a strongly correlat
 ed many-body pro cess. We observe extensive scaling of superradiance\, unc
 over superradiant revivals\, and reveal the ferromagnetic nature of superr
 adiance and the antiferromagnetic nature of subradiance. Our results reali
 ze a novel programmable platform for exploring and utilizing dissipative m
 any-body quantum physics\, opening new possibilities for photon capture\, 
 storage\, and atom&ndash\;photon entanglement.
DTSTAMP:20260421T234037Z
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