Condensed Matter Seminar (News&Views series): Thursday 10 June 2021 at 11:00 am

[OnlineCMSP]

Virtual - Zoom Meeting

CMSP News & Views Seminar
/
/
/The News & Views Seminars are meant to address our section as a whole, 
and therefore include an extensive pedagogical introduction to the 
topic, and present the main physical ideas of the research in a way 
understandable by everybody in the section. The goal is to bridge 
distances among different subgroups of our diverse CMSP section. //The 
diversity in our section makes it a unique place for crossing bridges 
among different topics, and for cross-fertilization among seemingly 
distant fields. /
*
*
** * * Thursday, 10 June 2021 at 11:00 a.m.*** * **

Speaker: *Zala LENARCIC*  (Istititute for TheoreticalPhysics, ETH Zurich)

Title:*From observations to complexity of quantum states: an 
unsupervised learning approach*

Register in advance at:
https://zoom.us/meeting/register/tJIrdu2hrT8oGNPKWCVPgPILLcdfrM8pLM36
After registering, you will receive a confirmation email containing 
information about joining the seminar.

_Abstract_:

The vast complexity is a daunting property of generic quantum states 
that poses a significant challenge for theoretical treatments, 
especially in non-equilibrium setups. Therefore, it is vital to 
recognize states which are locally less complex and thus describable 
with (classical) effective theories.

I will discuss how unsupervised learning can detect the local complexity 
of states. This approach can be used as a probe of scrambling and 
thermalization in chaotic quantum systems or to assign the local 
complexity of density matrices in open setups without knowing the 
corresponding Hamiltonian or Liouvillian. The analysis actually allows 
for the reconstruction of Hamiltonian operators or even noise-type that 
might be contaminating the measurements. Our approach is an ideal 
diagnostics tool for data obtained from (noisy) quantum simulators 
because it requires only practically accessible local observations. For 
example, it would be perfectly suited to detect the many-body 
localization transition or integrability effects from the experimental 
measurements obtained with cold atoms.

_M. Schmitt and Z. Lenarčič, arXiv:2102.11328.

_

----

CMSP, Condensed Matter & Statistical Physics Section
http://www.ictp.it/research/cmsp.aspx

The Abdus Salam International Centre for Theoretical Physics
https://www.ictp.it/  <https://www.ictp.it/>

    
----