[institut] [phys4phys] Group for Gravitation, Particles and Fields seminar, Friday, 22th of May, 2026

[Igor Prlina]

Dear colleagues,

You are cordially invited to the seminar of the Group for Gravitation, 
Particles and Fields, which will be held on Friday, 22th of May, 2026, 
at 11:00 at the Institute of Physics Belgrade, lecture hall 360.

The talk entitled:

Quantum information geometry and applications to phase transitions of 
many-body systems

will be given by Nikola Paunković (Institute of Physics Belgrade).

Abstract: As a follow-up to my previous seminar in which I introduced 
myself to colleagues from the Institute and Belgrade, I will present a 
brief technical overview of information geometry of quantum states and 
its application to the study of phase transitions in many-body systems, 
with a special focus on the results I was involved in during the past 20 
years of research. On the example of classical physics and probability 
distributions, I will first briefly introduce how the notions of 
information and geometry fit in the description of this line of 
research. Then, I will analyse in more detail three particular 
geometries of quantum states: a pure-state U(1) Berry gauge geometry, 
and two distinct mixed state geometries, one equipped with U(N) gauge 
group (Uhlmann), as well as the so-called interferometric geometry 
obtained from a symmetry broken Uhlmann gauge group [U(N) --> \otimes_i 
U(N_i), with \sum_i N_i = N]. I will then move to describe the so-called 
fidelity approach to the study of phase transitions. Being based on an 
abstract notion of state distinguishability (the notion that gives rise 
to information geometry), it is intended to present a general approach 
to the study of phase transitions that goes beyond Landau Ginzburg and 
other partial approaches. I will introduce the so-called fidelity 
susceptibility (a metric field over the space of states) and discuss it 
on a few examples of many-body systems, showing its explicit connection 
to dynamical susceptibilities of both zero-temperature quantum and 
finite-temperature equilibrium phase transitions. If time permits, I 
will also briefly discuss recently introduced non-equilibrium dynamical 
phase transitions and their connection to the geometry of channels and 
processes.

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Time: May 22, 2026 11:00 Belgrade

Institute of Physics Belgrade, lecture hall 360, 2nd floor

BigBlueButton platform link: 
https://gravityserver.ipb.ac.rs/b/mar-ae0-f4q-qww

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Best regards,
Igor Prlina
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