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SUMMARY:QSE Quantum Seminar: Emergence of non-Gaussian correlations in str
 ongly-interacting ultracold Bose gases
DTSTART:20240130T120000
DTEND:20240130T133000
DTSTAMP:20260921T194911Z
UID:41fb1775f16a1f274671f7d821d9860b0183ae99074b5279df2b3800
CATEGORIES:Conferences - Seminars
DESCRIPTION:David Clément\nPlease join us for the QSE Center Quantum S
 eminar with Prof. David Clément from the Institute d’optique graduat
 e school\, who will speak Tuesday January 30 on "Emergence of non-Gauss
 ian correlations in strongly-interacting ultracold Bose gases".\nLocation:
  CE 1 100\n\nPizzas will be available before the seminar at 12:00. All Ph
 Ds\, postdocs\, students\, and PIs are welcome to join us.\n\nTITLE: Emer
 gence of non-Gaussian correlations in strongly-interacting ultracold Bose 
 gases\n\nABSTRACT: \nStrongly correlated quantum matter is characterised 
 by properties that cannot be understood in terms of linear fluctuations an
 d theory of free quasi-particles. Quantum fluctuations in such systems are
  large and generically exhibit non-Gaussian statistics -- a property captu
 red only by inspecting high-order correlations\, whose quantitative recons
 truction poses a formidable challenge to both experiments and theory alike
 . A prime example of correlated quantum matter is the strongly interacting
  Bose fluid\, realized by superfluid Helium and\, more recently\, ultra-co
 ld atoms. In this talk\, I will report on our work to understand the emerg
 ence of non-Gaussian correlations in interacting bosons realised with ultr
 acold Helium atoms. \nI will first discuss the weakly-interacting regime 
 where Bogoliubov theory treats fluctuations as linear and predicts that in
 teractions promotes pairs of bosons with opposite momenta outside the cond
 ensate\, the quantum depletion. Exploiting the capability to detect indivi
 dual metastable Helium atoms after a long free-fall expansion [1]\, we con
 firm this microscopic prediction [2]. I will then address the strongly-int
 eracting regime that we enter using an optical lattice [3]. We observe tha
 t the Bogoliubov pairing is suppressed as interactions become stronger. Th
 is departure from the predictions of Bogoliubov theory signals the onset o
 f the strongly correlated regime\, as confirmed by numerical simulations t
 hat highlight the role of non-linear quantum fluctuations in our system. A
 dditionally\, our measurements unveil a non-zero four-operator cumulant at
  even stronger interactions\, which is a direct signature of non-Gaussian 
 correlations [4].\n[1] H. Cayla et al. Physical Review A 97\, 061609(R) (2
 018)\; A. Tenart et al. Physical Review Research 2\, 013017 (2020).\n[2] A
 . Tenart et al. Nature Physics 17\, 1364 (2021).\n[3] C. Carcy et al. Phys
 ical Review Letters 126\, 045301(2021).\n[4] J.-P. Bureik et al. In prepar
 ation (2024).\n\nBIO: David Clément is a Professor at the Institute d’
 optique graduate school in Palaiseau in France. Previously he was a junior
  member of the university of France and a post doc in Florence in Italy. H
 e did his PhD from 2004-2007 with Alan Aspect.
LOCATION:https://plan.epfl.ch/?room==CE%201%20100
STATUS:CONFIRMED
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