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DTSTAMP:20260405T162031Z
UID:61825fbc890a5764922165@ist.ac.at
DTSTART:20211111T130000
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DESCRIPTION:Speaker: Qi-Ming Chen\nhosted by Johannes Fink\nAbstract: Under
 standing the indeterministic phenomena in a deterministic nonlinear system
  has been an implicit dream since Lorenz named it the "butterfly effect". 
 A prototypical example is the hysteresis and bistability of a Duffing osci
 llator\, which is traditionally attributed to the competition between two 
 strange attractors corresponding to two coexisting steady states in a doub
 le-well potential. However\, this interpretation fails in a quantum-mechan
 ical perspective where only one steady state is allowed in the whole param
 eter space. Here\, we measure the non-equilibrium dynamics of a supercondu
 cting Duffing oscillator and reconcile the classical and quantum theories 
 in a unified picture. We demonstrate that the traditionally regarded stead
 y states are in fact metastable states\, which have a remarkably long life
 time but should eventually relax to the unique and non-classical steady st
 ate allowed by quantum mechanics. Hence the hysteresis and bistability are
  measurement outcomes of the system in different relaxation stages. By eng
 ineering the metastability lifetime increasingly large\, we observe a firs
 t-order dissipative phase transition which simulates a sudden change of th
 e photon density in a 11-site driven-dissipative Bose-Hubbard lattice. We 
 also reveal the microscopic picture of the transition process by quantum s
 tate tomography. Our results provide a comprehensive understanding of the 
 Duffing oscillator and reveal the quantum-mechanical origin of its well-kn
 own chaotic behaviors. They form an essential step towards understanding c
 haos and should stimulate interest in exploring non-equilibrium physics in
  driven-dissipative systems.
LOCATION:Foyer seminar room Ground floor / Office Bldg West (I21.EG.128)\, 
 ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Qi-Ming Chen: Quantum critical properties of a superconducting Duff
 ing oscillator around a first-order dissipative phase transition
URL:https://talks-calendar.ista.ac.at/events/3408
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