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SUMMARY:Anti-thermalization: Heating by cooling and vice versa. - Prof Sho
 van Dutta (Raman Research Institute)
DTSTART:20250121T130000Z
DTEND:20250121T140000Z
UID:TALK225844@talks.cam.ac.uk
CONTACT:nrc25
DESCRIPTION:Common intuition tells us that if one part of a connected syst
 em is cooled continuously\, the other parts should also cool down. This in
 tuition can be given a microscopic foundation for the case of a generic qu
 antum system coupled to a "lead" that is maintained at a given temperature
 . We show that by suppressing resonant energy exchange between the two par
 ts\, one can reverse the fate of the system\, namely\, it can heat up towa
 rd its most excited state as the lead is cooled to its ground state\, and 
 vice versa. This anti-thermal dynamics arises in a broad class of systems 
 with a conserved U(1) charge\, and can be tested with two qubits in existi
 ng setups. We show that the mechanism allows one to prepare mid-spectrum n
 onclassical states\, stable temperature gradients in closed systems\, and 
 highly athermal states where subspaces heat in the presence of overall coo
 ling. Our findings highlight the critical role played by the nature of the
  coupling and reveal a rich interplay between symmetry and resonance effec
 ts in the dynamics of thermalization.
LOCATION:TCM Seminar Room
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