TBD
","image_description":"","creation_date":"2026-02-05T16:08:19","last_modification_date":"2026-02-16T13:33:14","link_label":"Web Page","link_url":"https://ki.se/en/people/pierre-le-merre","canceled":"False","cancel_reason":"","place_and_room":"SV 2510","url_place_and_room":"","url_online_room":"","spoken_languages":["https://memento.epfl.ch/api/v1/spoken_languages/2/?format=json"],"speaker":"Pierre Le Merre, Lyon Neuroscience Research Centre, University of Lyon | Karolinska Institute, Stockholm","organizer":"BMI - LSENS Host: Carl Petersen","contact":"brain_mind@epfl.ch","is_internal":"False","theme":"","vulgarization":{"id":2,"fr_label":"Public averti","en_label":"Informed public"},"registration":{"id":3,"fr_label":"Entrée libre","en_label":"Free"},"keywords":"","file":null,"icalendar_url":"https://memento.epfl.ch/event/export/119598/","category":{"id":1,"code":"CONF","fr_label":"Conférences - Séminaires","en_label":"Conferences - Seminars","activated":true},"academic_calendar_category":null,"domains":[],"mementos":["https://memento.epfl.ch/api/v1/mementos/1/?format=json","https://memento.epfl.ch/api/v1/mementos/6/?format=json","https://memento.epfl.ch/api/v1/mementos/9/?format=json","https://memento.epfl.ch/api/v1/mementos/19/?format=json","https://memento.epfl.ch/api/v1/mementos/221/?format=json"]},{"id":71582,"title":"QSE Quantum Seminar: Benoit Vermersch and Robin Blume-Kohout","slug":"qse-quantum-seminar-benoit-vermersch-and-robin-blu","event_url":"https://memento.epfl.ch/event/qse-quantum-seminar-benoit-vermersch-and-robin-blu","visual_url":"https://memento.epfl.ch/image/32917/200x112.jpg","visual_large_url":"https://memento.epfl.ch/image/32917/720x405.jpg","visual_maxsize_url":"https://memento.epfl.ch/image/32917/max-size.jpg","lang":"en","start_date":"2026-04-24","end_date":"2026-04-24","start_time":"11:30:00","end_time":"13:30:00","description":"Please join us for the QSE Center Quantum Seminar with Robin Blume-Kohout from Sandia National Labs who will give the talk \"Assessing performance of logical operations 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 11:30 to 13:30.
\r\nLocation: GR B3 30
\r\n
\r\n11:30-12:20 Benoit Vermersch
\r\n12:20-12:40: Pizza lunch
\r\n12:40-13:30: Robin Blume-Khout
\r\nAll PhDs, postdocs, students, group leaders, and PIs are welcome to join us.
\r\n
\r\nABSTRACT:
\r\n1. \"Assessing performance of logical operations with detector error models\" - Robin Blume-Kohout
\r\nQuantum computing is rapidly transitioning from the “NISQ” paradigm in which circuits and gates are executed directly on physical qubits to a fault tolerant “FTQC” paradigm in which circuits and gates are executed on encoded, error-corrected 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 qubits demands a richer model — specifically, detector error models — that can describe QEC syndrome data. I’ll introduce 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 Clifford circuits [https://arxiv.org/abs/2504.15128], and how to generate detector error models from arbitrary circuit-level Markovian errors [https://arxiv.org/abs/2603.18457].
\r\n
\r\n2. \"Randomized measurements for large-scale quantum experiments\" - Benoit Vermersch
\r\nThe randomized measurements toolbox is now routinely used in quantum experiments to estimate fundamental quantum properties, such as entanglement [1].
\r\nWhile experimentalists appreciate the simplicity and robustness aspects of such measurement protocols, a challenge for theorists is to design strategies for overcoming statistical errors using \"cheap\" polynomial resources in system size.
\r\nIn this context, I will present recent upgrades to the randomized measurements toolbox that address this challenge for large-scale quantum states that are relevant to the field of quantum simulation. In particular, I will discuss efficient protocols for measuring entanglement [2] and performing state tomography [3].
\r\n
\r\n[1] A. Elben, S. T. Flammia, H.-Y. Huang, R. Kueng, J. Preskill, B. Vermersch, and P. Zoller, The Randomized Measurement Toolbox, Nat Rev Phys 5, 9 (2022).
\r\n[2] B. Vermersch, M. Ljubotina, J. I. Cirac, P. Zoller, M. Serbyn, and L. Piroli, Many-Body Entropies and Entanglement from Polynomially Many Local Measurements, Phys. Rev. X 14, 031035 (2024).
\r\n[3] M. Votto, M. Ljubotina, C. Lancien, J. Ignacio Cirac, P. Zoller, M. Serbyn, L. Piroli, B. Vermersch, arXiv:2507.12550
\r\n
\r\nBIOS:
\r\nRobin Blume-Kohout 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 enhance the performance of quantum computers and their components.
\r\nBenoit Vermersch is an associate professor at the 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-of-time ordered correlators, topological invariants; many-body entanglement theory; quantum networks: Light-matter interfaces, quantum state transfer protocols, waveguide quantum electrodynamics; and tensor-network numerical methods: Matrix-Product-States and DMRG,TEBD related algorithms.
We present a novel necessary and sufficient principle for multiple testing methods controlling an expected loss. This principle asserts that every such multiple testing method is a special case of a general closed testing procedure based on e-values. It generalizes the Closure Principle, known to underlie all methods controlling familywise error and tail probabilities of false discovery proportions, to a large class of error rates -- in particular to the false discovery rate (FDR). By writing existing methods as special cases of this procedure, we can achieve uniform improvements, as we demonstrate for the e-Benjamini-Hochberg and the Benjamini-Yekutieli procedures, and the self-consistent method of Su (2018). We also show that methods derived using our novel e-Closure Principle generally control their error rate not just for one rejected set, but simultaneously over many, allowing post hoc flexibility for the researcher.
\r\nMoreover, we show that because all multiple testing methods for all error metrics are derived from the same procedure, researchers may even choose the error metric post hoc. Under certain conditions, this flexibility even extends to post hoc choice of the nominal error rate.
\r\n
\r\n
\r\n
Directeur de thèse : Prof. A. Züttel,
\r\nProgramme doctoral en Chimie et génie chimique
\r\nThèse n° 11688
\r\n
\r\nPour participer à la soutenance publique, merci de contacter directement l’intervenant
Thesis Director: Prof. A. L. A. Persat,
\r\nBiotechnology and Bioengineering doctoral program
\r\nThesis Nr. 11340
\r\n
\r\nTo take part in the public defense, please contact directly the speaker
Thesis Directors: Prof. Y. Perriard, Dr Y. R. C. Civet
\r\nAdvanced Manufacturing doctoral program
\r\nThesis Nr. 11322
\r\n
\r\nTo take part in the public defense, please contact directly the speaker
Thesis Directors: Prof. R. Gruetter, Dr A. Capozzi
\r\nPhysics doctoral program
\r\nThesis Nr. 11427
\r\n
\r\nTo take part in the public defense, please contact directly the speaker
Thesis Director: Prof. G. De Micheli,
\r\nComputer and Communication Sciences doctoral program
\r\nThesis Nr. 11412
\r\n
\r\nTo take part in the public defense, please contact directly the speaker
Thesis Directors: Prof. P. Scarlino, Dr P. Harvey-Collard
\r\nPhysics doctoral program
\r\nThesis Nr. 11800
\r\n
\r\nTo take part in the public defense, please contact directly the speaker