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UID:6a0267eee9c7b
DTSTART:20260513T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20260513T110000Z
LOCATION:Seminar Room
SUMMARY:ICFO | LEONARDO BEZZO
CLASS:PUBLIC
DESCRIPTION:Symmetry-based classification of quantum phases of matter is on
 e of the most foundational organizing principles in physics\; however\, an
  analogous framework for mixed\, decohered quantum states has only begun t
 o emerge. A central new concept is strong-to-weak spontaneous symmetry bre
 aking (SW-SSB)\, a sharp transition in mixed quantum states that is invisi
 ble to any observable linear in the density matrix and that has since been
  predicted across a broad class of open and monitored quantum systems. It 
 also provides a unifying language for phenomena as disparate as the decoda
 bility of topological quantum memories and the emergence of classical hydr
 odynamics from decohered quantum dynamics. Here we report the first experi
 mental observation of SW-SSB\, in dephased single-component fermionic matt
 er imaged by a quantum gas microscope. A quantum-classical estimator built
  on a machine-learned Gaussian reference state gives direct access to the 
 nonlinear R&eacute\;nyi-1 and R&eacute\;nyi-2 correlators that diagnose SW
 -SSB\, and reveals long-range R&eacute\;nyi order in the dephased Fermi li
 quid. Adding a commensurate superlattice drives the underlying fermions th
 rough a metal-to-insulator transition that\, after full dephasing\, manife
 sts as a sharp SW-SSB phase transition. Our results uncover the symmetry p
 rinciple behind information-theoretic transitions in open quantum systems\
 , and extend Landau's symmetry paradigm into the regime of real\, decoheri
 ng quantum devices.
DTSTAMP:20260511T233614Z
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