Journée Théorie du CPTGA

lundi 27 sept. 2021, 08:00 → 17:05 Europe/Paris

Auditorium (LAPTh)

Le CPTGA vous invite à sa 12ème "Journée de Physique Théorique".

Le but de ces journées est de permettre des échanges entre physiciens théoriciens de Grenoble/Annecy travaillant dans des domaines très variés. Il est à la fois question de comprendre de la belle science et de découvrir le travail des collègues locaux.

Les thèmes de la Journée Théorie 2021 sont « Matière et énergie noires » et « Information quantique ».

Le programme sur le site web est provisoire. Il sera complété au fur et à mesure.

Merci de s'inscrire avant le 16 septembre 2021.

08:00 → 08:05 Bus departure from Grenoble

09:45 → 10:00 Welcome

10:00 → 10:45 Jérémie Quevillon (LPSC): Particle dark matter candidates

quevillon_CPTGA_2021.pdf

10:45 → 11:00 Pause café (Coffea break)

11:00 → 11:45 Killian Martineau (LPSC): Dark energy as a probe of quantum gravity

Martineau-CPTGA-09:21.pdf

11:45 → 12:30 Aniket Joglekar (LAPTh): Neutron Stars as Dark Matter Laboratories

Neutron stars can be excellent accumulators of dark matter owing to their strong gravity. Strong gravity offers them some distinct advantages over terrestrial searches for dark matter. This leads to signatures in various forms such as heating and collapse to a black hole. In this talk I will discuss various detection opportunities and compare them with existing searches.

CPTGA_Aniket_1.pdf

12:30 → 13:30 Lunch: Vegetarian meal

13:30 → 14:00 General discussion: how CPTGA can help you?

14:00 → 14:45 Benoît Vermersch (LPMMC): Probing entanglement in quantum technologies

20210927Vermersch_CPTGA.pdf

14:45 → 15:00 Pause café (Coffea break)

15:00 → 15:45 Michele Filippone (CEA): Quantum simulation with solid-state quantum technologies

Filippone_CPTGA.pdf

15:45 → 16:30 Cécilia Lancien (Institut Fourier): Typical correlations and entanglement in random tensor network states

Tensor network states are used extensively as a mathematically convenient description of physically relevant states of many-body quantum systems. Those built on regular lattices, i.e. matrix product states (MPS) in dimension 1 and projected entangled pair states (PEPS) in dimension 2 or higher, are of particular interest in condensed matter physics. In this talk, I will try to answer the following general question: which features of MPS and PEPS are generic and which are, on the contrary, exceptional? Or to rephrase it: given an MPS or PEPS sampled at random, what are the features that it displays with either high or low probability? One property which we will focus on is that of having either rapidly decaying or long-range correlations. In a nutshell, the main result I will state is that translation-invariant MPS and PEPS typically exhibit exponential decay of correlations, at a provably high rate. I will show two distinct ways of getting to this conclusion, depending on the dimensional regime under consideration. Both yield intermediate results which are of independent interest, namely: the parent Hamiltonian and the transfer operator of such MPS and PEPS typically have a large spectral gap. If time allows, I will also present on-going attempts at quantifying the amount of genuinely multipartite entanglement in such random MPS and PEPS.
The talk will be based mainly on a joint work with David Perez-Garcia, available at arXiv:1906.11682, and on some work in progress with Ion Nechita.

Lancien CPTGA.pdf

17:00 → 17:05 Bus departure