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UID:0-932@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20240125T110000
DTEND;TZID=Europe/Paris:20240125T120000
DTSTAMP:20240112T221324Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-claudia-artiaco-kth-stoccolma/
SUMMARY:Séminaire du LPTMS : Claudia Artiaco (KTH Stockholm) - Salle des s
 éminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 25 Jan 24 11:00
DESCRIPTION:The time evolution of local informationClaudia Artiaco (KTH Sto
 ckholm)During the time evolution of many-body systems entanglement spreads
  rapidly\, limiting exact simulations to small-scale systems and small tim
 escales. Quantum information tends\, however\, to flow towards larger scal
 es without returning to local scales\, such that its detailed large-scale 
 structure does not directly affect local observables. This allows for the 
 removal of large-scale quantum information in a way that preserves all loc
 al observables and gives access to large-scale and large-time quantum dyna
 mics. To this end\, in [2] we proposed a novel approach that uses the rece
 ntly introduced information lattice to organize quantum information into d
 ifferent scales [1]\, allowing us to define local information and informat
 ion currents which we employ to systematically discard long-range quantum 
 correlations in a controlled way. Our approach relies on decomposing the s
 ystem into subsystems up to a maximum scale and time evolving the subsyste
 m density matrices by solving the subsystem von Neumann equations in paral
 lel. Importantly\, the information flow needs to be preserved during the d
 iscarding of large-scale information. To achieve this without the need to 
 make assumptions about the microscopic details of the information current\
 , we introduce a second scale at which information is discarded while usin
 g the state at the maximum scale to accurately obtain the information flow
 . The resulting algorithm\, to which we refer to as local-information time
  evolution (LITE)\, is highly versatile and suitable for investigating man
 y-body quantum dynamics in both closed and open quantum systems with diver
 se hydrodynamic behaviors.In this talk\, I will present results obtained v
 ia LITE for the energy transport in the mixed-field Ising model\, where we
  accurately determine the power-law exponent and the energy diffusion cons
 tant [2]. Furthermore\, I will sketch how we used the LITE approach to rep
 roduce and interpret the results found in a recent experiment with NV cent
 ers in diamonds [3]. Finally\, I will briefly mention how the information 
 lattice can be employed to obtain insightful results about the spatial str
 ucture of entanglement in generic many-body quantum states [4].[1] T. Klei
 n Kvorning\, L. Herviou\, and J. H. Bardarson\, Time-evolution of local in
 formation: Thermalization dynamics of local observables\, SciPost Phys. 13
 \, 080 (2022).[2] C. Artiaco\, C. Fleckenstein\, D. Aceituno\, T. Klein Kv
 orning\, and J. H. Bardarson\, Efficient Large-Scale Many- Body Quantum Dy
 namics via Local-Information Time Evolution\, arXiv:2310:06036.[3] K. Hark
 ins et al.\, Nanoscale engineering and dynamical stabilization of mesoscop
 ic spin textures\, arXiv:2310:05635.[4] C. Artiaco\, T. Klein Kvorning\, D
 . Aceituno\, L. Herviou\, and J. H. Bardarson\, In preparation\, 2024.
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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TZID:Europe/Paris
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DTSTART:20231029T020000
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