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SUMMARY:Junior Quantum Seminar - Gaia Bolognini & Emanuele Tirrito
DTSTART:20260602T093000
DTEND:20260602T110000
DTSTAMP:20260527T185706Z
UID:4d933d69937650891ae0cb730028252871ddfed1de8f37287bb48cba
CATEGORIES:Conferences - Seminars
DESCRIPTION:Gaia Bolognini \n\nEmanuele Tirrito \nPlease join us for th
 e Junior Quantum Seminar with Gaia Bolognini from the Laboratory for 
 Quantum Gases (LQG)\, IPHYS\, EPFL who will give the talk "Density Wave 
 Ordering in Strongly Interacting Fermi Gases" and Emanuele Tirrito from
  the Laboratory of Theoretical Physics of Nanosystems (LTPN)\, IPHYS\, E
 PFL who will give the talk "Quantum Complexity in Many-Body Systems: Fro
 m Entanglement to Magic" on Tuesday June 2nd from 9h30-11h.\n\nPLEASE NOT
 E: The Junior Quantum Series are for gathering  the junior quantum com
 munity of master's students\, PhDs and post-docs at EPFL\, to create a non
 -judgmental space were scientific ideas can be shared between peers. This 
 event is not for Professors or senior researchers. \n\nABTRACT:\n1. Dens
 ity Wave Ordering in Strongly Interacting Fermi Gases\nAnalog quantum simu
 lations using ultracold atoms offer exciting opportunities to investigate 
 many-body systems in highly controllable and tunable settings. While mos
 t studies have focused on simulation of systems with short-range interacti
 ons\, their interplay with long-range interactions remains largely unexp
 lored. \nIn our experimental platform\, the atomic ensemble is strongly c
 oupled to a high finesse optical resonator\, whose photons mediate an effe
 ctive long-range interaction among the particles. Upon reaching a critical
  long-range interaction strength\, the system undergoes a phase transition
  into a density wave ordered state\, characterized by the superradiant b
 uild-up of the cavity field and the atomic self-organisation into a crysta
 lline lattice. While this phenomenon has been extensively studied in bos
 onic quantum gases\, we explore the effect of this transition in a degener
 ate two-component Fermi gas with tunable short-range interactions. \n\n
 I will present our recent experimental results\, where high-resolution mic
 roscopy yields the first real-space observation of the periodic density mo
 dulation characterizing the density-wave ordered state. Moreover\, the mi
 crometer-scale resolution gives access to high-frequency spatial correlati
 ons of the gas in both the density and magnetization observables\, and e
 nables precise shaping of the trapping potential - significantly expanding
  the degree of control over the many-body state. \nWe make use of this ve
 rsatile platform to explore the interplay between the cavity field and the
  atomic ordering and to investigate how the many-body state of the paired 
 Fermi gas is reshaped by the cavity mediated long-range interactions. \n\
 n2. Quantum Complexity in Many-Body Systems: From Entanglement to Magic\n
 Understanding what makes a quantum many-body state complex is a central qu
 estion in quantum information\, quantum computation\, and condensed matter
  physics. Traditionally\, entanglement has played a central role in this
  discussion: it captures genuinely quantum correlations\, constrains class
 ical simulability\, and provides a powerful diagnostic of phases of matte
 r and out-of-equilibrium dynamics. However\, entanglement alone does not f
 ully characterize the computational complexity of quantum states. In part
 icular\, highly entangled states can sometimes be efficiently simulated\,
  while universal quantum computation requires an additional resource kno
 wn as magic\, or non-stabilizerness. \n \nIn this talk\, I will give a b
 road introduction to quantum complexity in many-body systems\, focusing on
  the complementary roles of entanglement and magic. I will explain the phy
 sical meaning of magic\, its connection to stabilizer states and Clifford 
 circuits\, and why it is necessary for quantum computational advantage. I 
 will then discuss how magic can be generated and diagnosed in many-body dy
 namics\, and how it provides new insight into questions such as thermali
 zation\, quantum chaos\, transport\, and classical simulability. \n\n\nB
 IO:\nGaia Bolognini is currently a third year PhD student in the Labora
 tory for Quantum Gases (LQG) at EPFL under the supervision of professor 
 Jean-Philippe Brantut. Her research focuses on atomic interacting matter\,
  quantum gases and cavity quantum electrodynamics. She obtained her Mast
 er's degree at EPFL\, where she focused on the assembly and the design of
  a new technology for quantum gas experiments\, the 'cavity-microscope'.
  She obtained her Bachelor's degree at University of Milano-Bicocca\, in
  my hometown. \n\nEmanuele Tirrito obtained his Master’s degree in Phy
 sics from the University of Pisa\, working on relaxation and prethermaliz
 ation in one-dimensional quantum systems. He then completed his PhD at ICF
 O in Barcelona\, where he studied topological phases of matter and develop
 ed tensor-network methods for strongly correlated systems. After postdocto
 ral positions at SISSA\, the University of Trento\, and ICTP\, his researc
 h has progressively moved toward quantum information aspects of many-body 
 physics\, with a particular focus on entanglement\, non-stabilizerness or
  “magic”\, measurement-induced transitions\, and quantum simulation. 
 He is currently an SNSF Postdoctoral Fellow at EPFL. \n 
LOCATION:CM 0 13 https://plan.epfl.ch/?room==CM%200%2013
STATUS:CONFIRMED
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