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SUMMARY:QSE Quantum Seminar: Benoit Vermersch and Robin Blume-Kohout
DTSTART:20260424T113000
DTEND:20260424T133000
DTSTAMP:20260528T120535Z
UID:151887a04f90b1ca329e2f030d90cd20e7d4b13fc742edf37ffef6b9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Robin Blume-Kohout   Benoit Vermersch   \nPlease join us 
 for the QSE Center Quantum Seminar with Benoit Vermersch from Quobly
  and UGA who will give the talk "Randomized measurements for large-scale
  quantum experiments" and Robin Blume-Kohout from Sandia National Labs 
 who will give the talk "Assessing performance of logical operations with d
 etector error models" on Friday April 24 from 11:30 to 13:30.\nLocation: G
 R B3 30\n\n11:30-12:20 Benoit Vermersch\n12:20-12:40: Pizza lunch\n12:40-1
 3:30: Robin Blume-Khout\nAll PhDs\, postdocs\, students\, group leaders\, 
 and PIs are welcome to join us.\n\nABSTRACT:\n1. "Randomized measurements
  for large-scale quantum experiments" -  Benoit Vermersch\nThe randomize
 d measurements toolbox is now routinely used in quantum experiments to est
 imate fundamental quantum properties\, such as entanglement [1].\nWhile ex
 perimentalists appreciate the simplicity and robustness aspects of such me
 asurement protocols\, a challenge for theorists is to design strategies fo
 r overcoming statistical errors using "cheap" polynomial resources in syst
 em size.\nIn this context\, I will present recent upgrades to the randomiz
 ed measurements toolbox that address this challenge for large-scale quantu
 m states that are relevant to the field of quantum simulation. In particul
 ar\, I will discuss efficient protocols for measuring entanglement [2] and
  performing state tomography [3]. \n \n[1] A. Elben\, S. T. Flammia\, H.
 -Y. Huang\, R. Kueng\, J. Preskill\, B. Vermersch\, and P. Zoller\, The Ra
 ndomized Measurement Toolbox\, Nat Rev Phys 5\, 9 (2022).\n[2] B. Vermersc
 h\, M. Ljubotina\, J. I. Cirac\, P. Zoller\, M. Serbyn\, and L. Piroli\, M
 any-Body Entropies and Entanglement from Polynomially Many Local Measureme
 nts\, Phys. Rev. X 14\, 031035 (2024).\n[3] M. Votto\, M. Ljubotina\, C. L
 ancien\, J. Ignacio Cirac\, P. Zoller\, M. Serbyn\, L. Piroli\, B. Vermers
 ch\,  arXiv:2507.12550\n\n2. "Assessing performance of logical operations
  with detector error models" - Robin Blume-Kohout \nQuantum computing is 
 rapidly transitioning from the “NISQ” paradigm in which circuits and g
 ates are executed directly on physical qubits to a fault tolerant “FTQC
 ” paradigm in which circuits and gates are executed on encoded\, error-c
 orrected logical qubits.  We want to model errors in gates.  Logic gates
  on physical qubits are modeled by process matrices\, derived from theory 
 or estimated from tomography.  But describing logical gates on logical qu
 bits demands a richer model — specifically\, detector error models — t
 hat can describe QEC syndrome data.  I’ll introduce detector error mode
 ls and summarize three recent papers in which we show how to estimate dete
 ctor error models from data [https://arxiv.org/abs/2504.14643]\, how to si
 mulate arbitrary small Markovian errors in Clifford circuits [https://arxi
 v.org/abs/2504.15128]\, and how to generate detector error models from arb
 itrary circuit-level Markovian errors [https://arxiv.org/abs/2603.18457].\
 n\nBIOS:\nBenoit Vermersch is an associate professor at the University of
  Grenoble Alpes\, member of the LPMMC currently on leave in the quantum st
 artup Quobly Research interests include implementations of quantum process
 ing units with cold atoms\, trapped ions\, superconducting qubits\; measur
 ement protocols for entanglement-related quantities\, out-of-time ordered 
 correlators\, topological invariants\; many-body entanglement theory\; qua
 ntum networks: Light-matter interfaces\, quantum state transfer protocols\
 , waveguide quantum electrodynamics\; and tensor-network numerical methods
 : Matrix-Product-States and DMRG\,TEBD related algorithms.\nRobin Blume-Ko
 hout was born on a kitchen table in the Alaska Bush almost (but not quite)
  50 years ago.  Unfortunately\, things went downhill thereafter.  He is 
 now the founder and codirector of Sandia’s Quantum Performance Lab (QPL)
 \, where he and his fellow malcontents dream up new ways to assess and enh
 ance the performance of quantum computers and their components.
LOCATION:GR B3 30 https://plan.epfl.ch/?room==GR%20B3%2030
STATUS:CONFIRMED
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