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Disorder-tunable entanglement at infinite temperature.

Hang DongJean-Yves DesaulesYu GaoNing WangZexian GuoJiachen ChenYiren ZouFeitong JinXuhao ZhuPengfei ZhangHekang LiZhen WangQiujiang GuoJunxiang ZhangLei YingZlatko Papić
Published in: Science advances (2023)
Emerging quantum technologies hold the promise of unravelling difficult problems ranging from condensed matter to high-energy physics while, at the same time, motivating the search for unprecedented phenomena in their setting. Here, we use a custom-built superconducting qubit ladder to realize non-thermalizing states with rich entanglement structures in the middle of the energy spectrum. Despite effectively forming an "infinite" temperature ensemble, these states robustly encode quantum information far from equilibrium, as we demonstrate by measuring the fidelity and entanglement entropy in the quench dynamics of the ladder. Our approach harnesses the recently proposed type of non-ergodic behavior known as "rainbow scar," which allows us to obtain analytically exact eigenfunctions whose ergodicity-breaking properties can be conveniently controlled by randomizing the couplings of the model without affecting their energy. The on-demand tunability of quantum correlations via disorder allows for in situ control over ergodicity breaking, and it provides a knob for designing exotic many-body states that defy thermalization.
Keyphrases
  • molecular dynamics
  • energy transfer
  • density functional theory
  • high resolution
  • molecular dynamics simulations
  • healthcare
  • mass spectrometry
  • quantum dots