Presentation of IPhT : The Institute of Theoretical Physics (IPhT) is an Institute of the Direction of Fundamental Research (DRF) of the Commissariat for Atomic Energy and Alternative Energies (CEA).

Teaching ideal quantum measurements

Former director of the Service de Physique Théorique de Saclay (1979-1987) [1], our friend and colleague Roger Balian has just published with his collaborators Armen Allahverdyan, Yerevan Physics Institute, and Theo M. Nieuwenhuizen, Institute for Theoretical Physics Amsterdam, on the journal *Comptes Rendus. Physique* de l'Académie des Sciences [2].

In this publication, the authors present a graduate course on ideal measurements, which are dynamic processes coupling the quantum system under test and a measuring device, analyzed within the framework of quantum statistical mechanics.

[1] Short biography in « Roger Balian is 80! »

[2] *Comptes Rendus. Physique* 2024, Vol. 25, p. 251-287. https://doi.org/10.5802/crphys.180

R. Guida, 2024-07-12 20:18:00

Next arrival of Olivier Gingras at IPhT!

Olivier Gingras will join the IPhT in early 2025 on a permanent joint position at the IPhT and the QCC, Flatiron, New York. Part of the challenge of this position will be to facilitate interactions and collaborations between the two institutes on the theme of the quantum N-body problem.

Olivier did his PhD in Sherbrooke and Montreal, Canada, on the N-body quantum problem, and acquired expertise in DFT (Density Functional Theory), DMFT (Dynamical Mean Field Theory) and the physics of superconducting gap symmetry in Strontium Ruthenate compounds. Since 2022, he has been a post-doc at CCQ, during which he has been able to broaden his numerical expertise without forgetting interactions with experimentalists.

With his openness to a wide range of numerical expertise and his sensitivity to the importance of experimental studies in quantum materials research, Olivier will be a tremendous asset to numerical and phenomenological physics on the Saclay plateau, and will be essential in federating and maintaining collaboration between DRF and CCQ. Welcome to the IPhT Olivier, for a brilliant career ahead!

E. De-laborderie, 2024-07-05 14:19:00

Supersymmetry Meets Random Matrices

Computing observables in quantum field theory in the regime when the particles interact strongly represents a fundamental challenge in theoretical physics. Supersymmetric quantum field theories, which are characterised by interactions that preserve a symmetry relating bosons (integer spin) and fermions (half-integer spin), offer a powerful training ground for developing the computational tools that are required to address this problem.

A team consisting of Gregory Korchemsky (Institut de Physique Théorique, CNRS) and two Hungarian collaborators, Zoltan Bajnok and Bercel Bordis (*HUN-REN Wigner Research Center for Physics*), has recently developed a new, general method to systematically compute a special class of important observables in strongly coupled four-dimensional supersymmetric gauge theories. Their findings has recently been published in the prestigious journal *Physics Review Letters* as Editors' Suggestion [1].

A distinguished feature of these observables is that, in the limit of a large gauge group rank (planar limit) and for any 't Hooft coupling, they can be expressed as determinants of certain semi-infinite matrices. Crucially, the same determinants have previously appeared in the context of random matrix theory, where they were computed exactly in terms of a well-known probability distribution known as the *"Tracy-Widom distribution"* (or a more general version of it).

This distribution is a powerful tool for analyzing a wide range of complex systems in physics (quantum chaos, directed polymers, surface growth, turbulence, etc.), revealing the underlying connections between seemingly disparate physical phenomena.

The Tracy-Widom distribution proves surprisingly versatile in supersymmetric gauge theories. It describes observables like the free energy on a sphere and correlations of specific operators and even more applications are anticipated. The team's findings provide a systematic treatment and new insights into the strong coupling regime of four-dimensional supersymmetric gauge theories, inviting further investigations in related theoretical frameworks. The technique developed by the authors is quite general and can be applied to determine the asymptotic behavior of a general class of determinants involving the so-called *"Bessel operators"*, this opening a new avenue for many physical and mathematical applications.

[1] Zoltan Bajnok, Bercel Boldis, and Gregory P. Korchemsky. *Tracy-Widom distribution in four- dimensional supersymmetric Yang-Mills theories. *Phys. Rev. Lett. **133**, 031601. https://doi.org/10.1103/PhysRevLett.133.031601

R. Guida, 2024-07-04 15:21:00

Magnetic quivers and Higgs mechanism

2024-06-28 19:15:00

Speakable and Unspeakable in Quantum Gravity

2024-06-28 18:56:00

Dilepton polarization as a signature of plasma anisotropy

2024-06-05 18:52:00

"Les Houches" International School of Physics (July 29- August 23)

2024-05-02 11:21:00

2024-05-02 10:36:00

The Institut de Physique Théorique celebrates Philippe Di Francesco's 60th birthday

2024-04-30 15:31:00

Next Carlo Heissenberg's arrival at IPhT!

2024-03-15 10:17:00

Measuring the speed of sound at 2.5 trillion degrees

2024-03-05 16:17:00

Two IPhT researchers feature in the latest issue of "Sciences et Avenir- La recherche".

2024-02-29 19:06:00

LISA mission gets the go-ahead from ESA

2024-01-26 16:35:00

2024-01-17 15:58:00

A Marc Barthélémy and Vincent Verbavatz's new book: Statistics of Urban populations.

2024-01-11 16:21:00

One IPhT scientist involved in the top 10 breakthroughs of 2023!

2024-01-10 10:55:00

Welcome to Anne Capdepon, Deputy Head of Research Support at the IPhT.

2023-12-14 09:54:00

The first images taken by Euclid revealed

2023-11-17 16:21:00

Celebration of IPHT's 60 years birthday

2023-11-17 15:42:00

A Starting ERC Grant for Ben Wieder

2023-09-06 15:32:00

Death of Michel Gaudin (02/12/1931 -- 04/08/2023)

2023-08-24 09:49:00

Efficient algorithms for scattering amplitudes

2023-07-12 15:18:00

Matt Von Hippel is to join IPhT on September 1.

2023-05-30 09:40:00

Monica Guica receives the CNRS bronze medal for the year 2023!

2023-04-03 15:21:00

27th Itzykson Conference : Fluctuations far from Equilibrium

2023-03-21 15:39:00

2023 Galileo Galilei Medal for David Kosower (IPhT), Zvi Bern(California U) and Lance Dixon (SLAC)

2023-02-17 09:04:00

Quantum networks : Entangled ions across the university campus Innsbruck

2023-02-10 15:11:00

Hamiltonian paths, a challenge for KPZ.

2023-02-03 15:19:00

Kibble-Zurek phenomenon: from the early Universe to a spin chain

2023-02-03 14:15:00

Kirone Mallick winner of the 2022 Physics French Society (SFP) Paul Langevin Prize

2023-02-01 15:18:00

EPS PhD prize awarded to IPhT student

2022-11-04 10:33:00

Exact Macroscopic Fluctuations Far from Equilibrium

2022-08-25 15:09:00

Preparation of the exploitation of the Euclid mission

2022-07-11 16:06:00

Retreat of the IPhT in Autrans : aftermath

2022-06-22 09:05:00

Arrival of Ben Wieder on next september

2022-06-17 15:12:00

Arrival of Dalimil Mazáč at IPhT

2022-06-07 10:14:00

Maps day at IPhT on 24 June 2022

2022-06-03 10:33:00

Quantum bounds and fluctuation-dissipation relations

2022-05-12 11:47:00

26ème conférence Itzykson : "Black-Hole Microstructure IV"

2022-05-12 10:32:00

Colloquium Rencontres de l'IPhT in Autrans (Vercors) from 23 to 25 May.

2022-05-12 10:02:00

An extension of Tutte's formula 60 years later

2022-04-20 11:13:00

2022-04-05 11:28:00

Public talk of Stephane Lavignac on Tuesday March 15th

2022-03-11 09:17:00

A new book written by Marc Barthélémy about spatial networks

2022-02-22 11:05:00

Cédric Villani at IPhT on March 1st

2022-02-22 10:26:00

Summer School in Cargèse around exotic superconductivity

2022-02-07 15:39:00

Langevin Prize of the French Society of Physics for Mariana Graña

2022-02-04 10:46:00

2022-02-01 09:21:00

Maxime Leroy joins the IPHT support team

2022-01-27 15:24:00

Un lien entre la masse du boson de Higgs et la constante cosmologique

2021-11-25 14:11:00

Conférence exceptionnelle de Cédric Villani le lundi 22 novembre à 19h30 (Institut Pascal)

2021-11-18 14:33:00

Mathematical Harmony and the Quantum World

2021-10-07 15:24:00

The art of mathematical physics

2021-09-01 16:31:00

Correlation functions and wave functions in solvable models

2021-08-31 16:44:00

2021-05-01 11:45:00

Multipole Ratios : A New Window into Black Holes

2020-11-27 15:16:00

Orazio Scarlatella lauréat du prix de thèse Physique des Ondes et de la Matière (PhOM) 2020

2020-11-26 11:07:00

Modeling the city: an equation ends centuries-old controversies

2020-11-19 11:10:00

Quantum entanglement: A single photon takes two optical paths by "entangling" them!

2020-10-15 15:06:00

An strongly secured encryption

2020-09-17 17:01:00

Un nouvel ouvrage co-écrit par Pierfrancesco Urbani, physicien à l’IPhT

2020-01-31 14:15:00

Un nouvel ouvrage co-écrit par Henri Orland, physicien à l'IPhT

2020-01-28 16:16:00