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).

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

The 15th of February, birthday of Galileo Galilei, **the 2023 Galileo Galilei Medal of INFN and GGI** has been awarded "for the development of powerful methods for high-order perturbative calculations in quantum field theory" **to David Kosower, researcher at the Institut de Physique Théorique, Zvi Bern(California U) and Lance Dixon (SLAC).**

**Congratulations!**

E. De-laborderie, 2023-02-17 09:04:00

Quantum networks : Entangled ions across the university campus Innsbruck

Trapped ions are one of the leading systems to build quantum computers. To link multiple such quantum systems, interfaces are needed through which the quantum information can be transmitted. Until now, trapped ions were only entangled with each other over a few meters in the same laboratory. **Researchers from the university of Innsbruck** succeeded to entangle two trapped ions located in two labs separated by 230 meters. These efforts have been supported by a theoretical model of a single trapped ion including most of experimental noise sources.

**The model, developed at IPhT,** provided a guidance for the experimentalists, showing for example what to expect when increasing the distance or helping to identify the most detrimental noise sources. With the entanglement of far away ions, Austrian researchers show that trapped ions are a promising platform for future quantum networks that span cities and eventually continents. The results have been published in Physical Review Letters. They have been highlighted by Editors’ Suggestion and a Synopsis in Physics.

Entanglement of trapped-ion qubits separated by 230 meters

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.130.050803

See also the Synopsis

https://physics.aps.org/articles/v16/s20

E. De-laborderie, 2023-02-10 15:11:00

Hamiltonian paths, a challenge for KPZ.

*Examples of measured exponents and their comparison to KPZ predictions, before and after renormalization*

** The famous KPZ formulas (Knizhnik-Polyakov-Zamolodchikov, 1988)** relate the critical exponents of statistical models on regular two-dimensional lattices to the exponents of the same models on planar random lattices. These relations, verified exactly in a large number of statistical mechanics systems, have now acquired a rigorous mathematical status, under certain technical assumptions of statistical independence. Hamiltonian paths on lattices, which are self-avoiding paths forced to visit all the sites of the lattice, constitute a critical statistical model where the geometrical constraints are particularly strong. A team at IPhT studied the case of the honeycomb lattice and its random counterpart, the bicubic lattice (a bipartite lattice made only of trivalent vertices colored in black and white so that the vertices of one color are connected only to those of the other color). The critical exponents in the first case are computed by standard Coulomb gas methods, while the critical exponents in the second case can be obtained numerically with a high accuracy from the exact enumeration of Hamiltonian path configurations for finite size lattices.

Surprisingly, the expected KPZ relations fail for some types of critical exponents, indicating that a new mechanism is at work which goes beyond their usual scope of application! A procedure (heuristic at this stage) of renormalization (readjustment of the KPZ formulas with a new parameter) is proposed which seems to restore the validity of these relations. The challenge is now to understand mathematically how the particular geometrical constraints of the Hamiltonian paths can influence the statistics of the bipartite random lattice, and lead to such a renormalization.

Ref: **P. Di Francesco, B. Duplantier, O. Golinelli and E. Guitter**, *Exponents for Hamiltonian paths on random bicubic maps* *and KPZ* arXiv :2210/08887 [math-ph]

E. De-laborderie, 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 results for the "box ball system", a cellular automaton with solitons

2022-10-11 10:10:00

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

Problems in Quantum Field Theory : a book by François Gelis.

2021-10-11 16:12:00

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

David Kosower lauréat de l'ERC Advanced Grant "Ampl2Einstein"

2020-04-03 15:57:00

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

Mon, Mar. 20th, 11:00-12:00

Séminaire de physique mathématique - Jules Lamers

Tue, Mar. 21st, 14:00-15:00

Séminaire de physique des particules et de cosmologie - Marco Gorghetto

Wed, Mar. 22nd, 14:15

Séminaire de matrices, cordes et géométries aléatoires - Alejandra Castro

Thu, Mar. 23rd, 11:30-12:30

Séminaire de physique des particules et de cosmologie - Federica Guidi