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DTSTART;TZID=America/Toronto:20230405T120000
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URL:https://uwaterloo.ca/institute-for-quantum-computing/events/iqc-student
 -seminar-featuring-xi-dai-0
LOCATION:QNC - Quantum Nano Centre 200 University Avenue West QNC 1201 Wate
 rloo ON N2L 3G1 Canada
SUMMARY:IQC Student Seminar Featuring Xi Dai
CLASS:PUBLIC
DESCRIPTION:LANDAU-ZENER TUNNELING: FROM WEAK TO STRONG ENVIRONMENT COUPLIN
 G\n\nAbstract:\n\nLandau-Zener tunneling\, which describes the transitions
  in a two-level\nsystem during the passage through an anti-crossing\, is a
  model\napplicable to a wide range of physical phenomena. Dissipation due 
 to\ncoupling between the system and the environment is an important factor
 \nin determining the transition rates. Using a superconducting tunable\nca
 pacitively shunted flux qubit\, we observe the crossover from weak to\nstr
 ong coupling to the environment. The weak coupling limit\ncorresponds to s
 mall system-environment coupling and leads to\nenvironment-induced thermal
 ization. In the strong coupling limit\,\nenvironmental polarizations dress
  the system and transitions occur\nbetween the dressed states. Our results
  confirm previous theoretical\nstudies of dissipative Landau-Zener tunneli
 ng in the weak and strong\ncoupling limits\, and motivate further work on 
 understanding the\nintermediate regime. This work is relevant for understa
 nding the role\nof open system effects in quantum annealing\, where Landau
 -Zener\ntransitions at small gaps\, occurring in large scale systems\, are
 \nimportant to understand for improving the success probability.\n\n \n\n
 This talk is based on the preprint arXiv:2207.02017.
DTSTAMP:20260407T053905Z
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