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SUMMARY:Shaping global behaviour by local dynamical interventions: Classic
 al and Quantum
DTSTART:20261007T123000Z
DTEND:20261007T133000Z
DTSTAMP:20261115T141200Z
UID:indico-event-53888@agenda.infn.it
DESCRIPTION:Speakers: Rupak Majumder (TIFR Mumbai India)\n\nMany-body syst
 ems can exhibit qualitatively distinct phases\, and their dynamics may dri
 ve them toward a macroscopic state that is not necessarily the one we desi
 re. This raises a natural question: Can we steer a many-body system from a
 n undesired phase or state to a desired one through occasional local dynam
 ical interventions\, without modifying the underlying interactions? In cla
 ssical settings\, we explore this question in a variety of spin and nonlin
 ear oscillator models\, spanning equilibrium and nonequilibrium systems\, 
 mean-field and non-mean-field interactions\, and systems with and without 
 quenched disorder. We show that by occasionally resetting a part of the sy
 stem to a desired configuration\, we can control the macroscopic phase tra
 nsitions of the system. By tuning a few control parameters\, namely\, the 
 size of the subsystem being reset\, the resetting rate\, and the configura
 tion to which it is reset\, we can not only shift transition points but al
 so alter the nature of the transitions. In quantum settings\, the goal is 
 more specific: Can we create a desired quantum state through occasional lo
 cal interventions? We show that interrupting the dynamics through measurem
 ent and postselection\, even at a single site\, is sufficient to reshape t
 he dynamics and guide the system toward a desired state. Together\, these 
 examples illustrate how local interventions can provide a general route to
  controlling global behaviour in both classical and quantum many-body syst
 ems\, without directly modifying the underlying interactions.\nReferences:
 \n[1] Physical Review E 109(6)\, 064137 (2024)[2] Physical Review Letter
 s 135 (12)\, 127103 (2025)[3] Physical Review E 114 (2)\, 024108 (2026)[4
 ] To appear\n\nhttps://agenda.infn.it/event/53888/
URL:https://agenda.infn.it/event/53888/
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