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UID:6aacaac5a19f5
DTSTART:20240613T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20240613T110000Z
LOCATION:Seminar Room
SUMMARY:ICFO | ALEKSANDER LASEK
CLASS:PUBLIC
DESCRIPTION:Thermodynamic systems typically conserve quantities (&ldquo\;ch
 arges&rdquo\;) such as energy and particle number. The charges are often a
 ssumed implicitly to commute with each other. Yet quantum phenomena such a
 s uncertainty relations rely on observables&rsquo\; failure to commute. Ho
 w do noncommuting charges affect thermodynamic phenomena? This question\, 
 upon arising at the intersection of quantum information theory and thermod
 ynamics\, spread recently across many-body physics.&nbsp\;\nUntil recently
 \, the&nbsp\;issue has remained theoretical. I will give an overview of no
 ncommuting-charge thermodynamics\, focusing on our experimental testing of
  its predictions\, with a trapped-ion simulator. We prepare 6&ndash\;21 sp
 ins in an approximate microcanonical subspace\, a generalization of the mi
 crocanonical subspace for accommodating noncommuting charges\, which canno
 t necessarily have well-defined nontrivial values simultaneously. We simul
 ate a Heisenberg evolution using laser-induced entangling interactions and
  collective spin rotations. The noncommuting charges are the three spin co
 mponents. We find that small subsystems equilibrate to near a recently pre
 dicted non-Abelian thermal state. This work bridges quantum many-body simu
 lators to the quantum thermodynamics of noncommuting charges\, the predict
 ions of which can now be tested.
DTSTAMP:20260918T030645Z
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