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SUMMARY:Symmetry-enforced quantum correlations in noisy and disordered qua
 ntum matter
DTSTART:20260423T100000Z
DTEND:20260423T110000Z
DTSTAMP:20260504T021600Z
UID:indico-event-9329@scitalks.tifr.res.in
DESCRIPTION:Speakers: Subhayan Sahu (Perimeter Institute))\n\nNoisy and di
 sordered quantum many-body systems are naturally described as ensembles\, 
 whose universal features are organized by how symmetry manifests: exactly 
 (strong) or on average (weak). I show that strong-weak symmetry interplay 
 enforces quantum correlations in two settings spanning quantum information
  and condensed-matter physics.First\, I analyze noisy quantum dynamics wit
 h strong symmetries. While noise typically suppresses entanglement\, stron
 g symmetry can protect it even in highly mixed states. For non-Abelian sym
 metry such as SU(2)\, the steady state spontaneously breaks strong-to-weak
  symmetry and exhibits logarithmically large entanglement [1]\; I also dis
 cuss analogous phenomena in symmetric thermal states [2].Second\, I carry 
 this framework into disordered systems\, focusing on critical random Hamil
 tonians with an average Lieb–Schultz–Mattis anomaly. Local operators f
 all into two universality classes by their strong and weak symmetry charge
 s\, with distinct experimental signatures. I confirm this in the random-si
 nglet Heisenberg chain and disordered free-fermions\, uncovering novel cri
 tical correlations [3].[1] "Symmetry enforced entanglement in maximally mi
 xed states" - Moharramipour\, Lessa\, Wang\, Hsieh\, SS (PRX Quantum 5\, 0
 40336).[2] “Symmetry enforces entanglement at high temperatures” - Neg
 ari\, Lessa\, SS (ArXiv: 2508.20166)[3] "Quantum criticality at strong ran
 domness: a lesson from anomaly" - Panahi\, SS\, Manjunath\, Wang (ArXiv: 2
 602.02648)\n \n\nhttps://scitalks.tifr.res.in/event/9329/
LOCATION:On zoom
URL:https://scitalks.tifr.res.in/event/9329/
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