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SUMMARY:Controlling openness in quantum matter with Floquet engineering an
 d quantum interferenceTBA
DTSTART:20260618T121500Z
DTEND:20260618T131500Z
DTSTAMP:20260717T113200Z
UID:indico-event-135@indico.zdv.uni-mainz.de
DESCRIPTION:Speakers: Artur Widera (RPTU University Kaiserslautern-Landau)
 \n\nCoupling to the environment is a defining feature of quantum systems a
 nd often limits coherence\, control\, and performance in applications rang
 ing from quantum simulation to sensing and information processing. Develop
 ing strategies to engineer and suppress unwanted dissipation therefore rem
 ains a central challenge across modern quantum science.\nIn this talk\, I 
 present how periodic driving can be used to gain unprecedented control ove
 r scattering processes in an ultracold gas of lithium-6 atoms. By Floquet 
 engineering magnetic Feshbach resonances\, we create tunable interaction r
 esonances whose position\, width\, and loss properties can be tailored in 
 situ. Interference between different Floquet pathways enables strong suppr
 ession of dissipation while preserving interaction control.\nBuilding on t
 hese capabilities\, we realize a bound state in the continuum (BIC)\, a co
 unterintuitive quantum state that remains localized despite being energeti
 cally embedded in a continuum of scattering states. The BIC emerges from d
 estructive interference between two coherently coupled Feshbach resonances
  and represents a controlled decoupling of a quantum state from its enviro
 nment. Using loss spectroscopy\, collective dynamics\, and rf photoassocia
 tion\, we directly observe the disappearance of coupling to the continuum 
 and identify the state as a Friedrich–Wintgen BIC.\nOur results demonstr
 ate how Floquet engineering and quantum interference can be used to contro
 l openness in quantum systems\, providing new tools for the design of diss
 ipation-engineered and non-Hermitian quantum matter.\n\nhttps://indico.zdv
 .uni-mainz.de/event/135/
LOCATION:Lorentz-Raum (05-127) (IPH)
URL:https://indico.zdv.uni-mainz.de/event/135/
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