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SUMMARY:Disorder-tunable entanglement at infinite temperature - Zlatko Pap
 ic\, University of Leeds
DTSTART:20240613T130000Z
DTEND:20240613T140000Z
UID:TALK215422@talks.cam.ac.uk
CONTACT:Gaurav
DESCRIPTION:Complex entanglement structures in many-body quantum systems o
 ffer potential benefits for quantum technology\, yet their applicability t
 ends to be severely limited by thermal excitations and disorder. In this t
 alk\, I will present our recent efforts to utilize a custom-built supercon
 ducting qubit ladder to realize non-thermalizing states with rich entangle
 ment structures in the middle of the energy spectrum. Despite effectively 
 forming an ``infinite” temperature ensemble\, these states robustly enco
 de quantum information far from equilibrium\, as we demonstrate by measuri
 ng the fidelity and entanglement entropy in the quench dynamics of the lad
 der. Our approach harnesses the recently proposed type of non-ergodic beha
 vior known as ``rainbow scar”\, which allows us to obtain analytically e
 xact eigenfunctions whose ergodicity-breaking properties can be convenient
 ly controlled by randomizing the couplings of the model\, without affectin
 g their energy.  The on-demand tunability of entanglement structure via di
 sorder allows for in situ control over ergodicity breaking and it provides
  a knob for designing exotic many-body states that defy thermalization.
LOCATION:TCM Seminar Room
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