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SUMMARY:QSE Quantum Seminar: Benoit Vermersch and Robin Blume-Kohout
DTSTART:20260424T113000
DTEND:20260424T140000
DTSTAMP:20260415T051540Z
UID:151887a04f90b1ca329e2f030d90cd20e7d4b13fc742edf37ffef6b9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Robin Blume-Kohout   Benoit Vermersch   \nPlease join us 
 for the QSE Center Quantum Seminar with Robin Blume-Kohout from Sandi
 a National Labs who will give the talk "Assessing performance of logical o
 perations with detector error models" and Benoit Vermersch from Quobly 
 and UGA who will give the talk "Randomized measurements for large-scale 
 quantum experiments" on Friday April 24 from 11:30pm to 2:00pm\nLocation:
  GR B3 30\n\nThe first talk will start at 11:30pm. Pizzas will be availab
 le at 12:20pm\, in between talks. All PhDs\, postdocs\, students\, group 
 leaders\, and PIs are welcome to join us.\n\nABSTRACT:\n1. "Assessing perf
 ormance of logical operations with detector error models" - Robin Blume-Ko
 hout \nQuantum computing is rapidly transitioning from the “NISQ” par
 adigm in which circuits and gates are executed directly on physical qubits
  to a fault tolerant “FTQC” paradigm in which circuits and gates are e
 xecuted on encoded\, error-corrected logical qubits.  We want to model er
 rors in gates.  Logic gates on physical qubits are modeled by process mat
 rices\, derived from theory or estimated from tomography.  But describing
  logical gates on logical qubits demands a richer model — specifically\,
  detector error models — that can describe QEC syndrome data.  I’ll i
 ntroduce detector error models and summarize three recent papers in which 
 we show how to estimate detector error models from data [https://arxiv.org
 /abs/2504.14643]\, how to simulate arbitrary small Markovian errors in Cli
 fford circuits [https://arxiv.org/abs/2504.15128]\, and how to generate de
 tector error models from arbitrary circuit-level Markovian errors [https:/
 /arxiv.org/abs/2603.18457].\n\n2. "Randomized measurements for large-scal
 e quantum experiments" -  Benoit Vermersch\nThe randomized measurements 
 toolbox is now routinely used in quantum experiments to estimate fundament
 al quantum properties\, such as entanglement [1].\nWhile experimentalists 
 appreciate the simplicity and robustness aspects of such measurement proto
 cols\, a challenge for theorists is to design strategies for overcoming st
 atistical errors using "cheap" polynomial resources in system size.\nIn th
 is context\, I will present recent upgrades to the randomized measurements
  toolbox that address this challenge for large-scale quantum states that a
 re relevant to the field of quantum simulation. In particular\, I will dis
 cuss efficient protocols for measuring entanglement [2] and performing sta
 te tomography [3]. \n \n[1] A. Elben\, S. T. Flammia\, H.-Y. Huang\, R. 
 Kueng\, J. Preskill\, B. Vermersch\, and P. Zoller\, The Randomized Measur
 ement Toolbox\, Nat Rev Phys 5\, 9 (2022).\n[2] B. Vermersch\, M. Ljubotin
 a\, J. I. Cirac\, P. Zoller\, M. Serbyn\, and L. Piroli\, Many-Body Entrop
 ies and Entanglement from Polynomially Many Local Measurements\, Phys. Rev
 . X 14\, 031035 (2024).\n[3] M. Votto\, M. Ljubotina\, C. Lancien\, J. Ign
 acio Cirac\, P. Zoller\, M. Serbyn\, L. Piroli\, B. Vermersch\,  arXiv:25
 07.12550\n\nBIOS:\nRobin Blume-Kohout was born on a kitchen table in the A
 laska Bush almost (but not quite) 50 years ago.  Unfortunately\, things w
 ent downhill thereafter.  He is now the founder and codirector of Sandia
 ’s Quantum Performance Lab (QPL)\, where he and his fellow malcontents d
 ream up new ways to assess and enhance the performance of quantum computer
 s and their components.\nBenoit Vermersch is an associate professor at th
 e University of Grenoble Alpes\, member of the LPMMC currently on leave in
  the quantum startup Quobly Research interests include implementations of 
 quantum processing units with cold atoms\, trapped ions\, superconducting 
 qubits\; measurement protocols for entanglement-related quantities\, out-o
 f-time ordered correlators\, topological invariants\; many-body entangleme
 nt theory\; quantum networks: Light-matter interfaces\, quantum state tran
 sfer protocols\, waveguide quantum electrodynamics\; and tensor-network nu
 merical methods: Matrix-Product-States and DMRG\,TEBD related algorithms.
LOCATION:GR B3 30 https://plan.epfl.ch/?room==GR%20B3%2030
STATUS:CONFIRMED
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