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SUMMARY:Junior Quantum Seminar - Linda Mauron/ Mario Di Luca
DTSTART:20251007T093000
DTEND:20251007T110000
DTSTAMP:20260916T182603Z
UID:9af6030eeab03b0315ad90920f583c57d64ff1e4bc8019f5177f7999
CATEGORIES:Conferences - Seminars
DESCRIPTION:Mario Di Luca and Linda Mauron\nPlease join us for the Jun
 ior Quantum Seminar with Mario Di Luca from the Laboratory of Quantum 
 Physics\, Topology and Correlations (LQP)\, EPFL who will give the talk
  "Measuring fractional charge in graphene using a quantum Hall antidot" 
 and Linda Mauron from the Computational Quantum Science Lab (CQSL)\, E
 PFL who will give the talk "Predicting Topological Entanglement Entropy 
 in a Rydberg analog simulator"on Tuesday October 7th from 9h30-11h.\n\nPLE
 ASE NOTE: The Junior Quantum Series are for gathering  the junior quant
 um community of master's students\, PhDs and post-docs at EPFL\, to creat
 e a non-judgmental space were scientific ideas can be shared between peers
 . This event is not for Professors or senior researchers. \n\nABTRACT: \
 n1. Measuring fractional charge in graphene using a quantum Hall antidot:
 \nThe detection of fractionally charged quasiparticles\, which arise in th
 e fractional quantum Hall regime\, is of fundamental importance for probin
 g their exotic quantum properties. While electronic interferometers have b
 een central to probe their statistical properties\, their interpretation i
 s often complicated by bulk-edge interactions. In this talk\, I will intro
 duce a simple gate-defined bilayer graphene antidot that operates in the C
 oulomb-dominated regime. This platform enables direct detection of quasipa
 rticle charge through straightforward conductance measurements\, bypassing
  the need for more complex techniques. I will show how this approach revea
 ls fractional charge in graphene and discuss how its simplicity and tunabi
 lity open the door to extending antidot-based measurements to other van de
 r Waals materials\, establishing a broadly applicable route to explore the
  quantum Hall effect.\n2. Predicting Topological Entanglement Entropy in 
 a Rydberg analog simulator:\nPredicting the dynamical properties of topolo
 gical matter is a challenging task\, not only in theoretical and experimen
 tal settings\, but also computationally. Numerical studies are often const
 rained to studying simplified models and lattices. Here we propose a time-
 dependent correlated ansatz for the dynamical preparation of a quantum-spi
 n-liquid state on a Rydberg atom simulator. Together with a time-dependent
  variational Monte Carlo technique\, we can faithfully represent the state
  of the system throughout the entire dynamical preparation protocol. We ar
 e able to match not only the physically correct form of the Rydberg atom H
 amiltonian but also the relevant lattice topology at system sizes that exc
 eed current experimental capabilities. This approach gives access to globa
 l quantities such as the topological entanglement entropy\, providing insi
 ght into the topological properties of the system. Our results confirm the
  topological properties of the state during the dynamical preparation prot
 ocol\, and deepen our understanding of topological entanglement dynamics. 
 We show that\, while the simulated state exhibits local properties resembl
 ing those of a resonating-valence-bond state\, in agreement with experimen
 tal observations\, it lacks the latter’s characteristic topological enta
 nglement entropy signature irrespective of the degree of adiabaticity of t
 he protocol.\n\nBIO: \nMario Di Luca is a PhD student at the Laboratory o
 f Quantum Physics\, Topology and Correlations (LQP) at EPFL. His research 
 focuses on graphene-based quantum Hall interferometry devices\, which he u
 ses to investigate the properties of anyonic quasiparticles. He obtained h
 is Bachelor’s and Master’s degrees in Physics from the University of P
 isa\, as well as the Engineering Diploma from the École polytechnique\, w
 here he studied the impact of boron-nitride alignment on graphene.\nLinda 
 Mauron is a PhD student at EPFL\, at the Computational Quantum Science Lab
  (CQST) of Prof. Giuseppe Carleo. She obtained her Bachelor’s and Master
 ’s degrees from EPFL. She obtained a MARVEL’s INSPIRE potentials grant
  for her Master project at Prof. Carleo’s lab\, which she is now pursuin
 g with her PhD.\n\n 
LOCATION:CO 120
STATUS:CONFIRMED
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