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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum information science

Background:

  • Emerging quantum technologies offer solutions to complex problems in physics.
  • Quantum systems can exhibit unprecedented phenomena and behaviors.
  • Understanding non-equilibrium quantum states is crucial for advancing quantum science.

Purpose of the Study:

  • To realize and characterize non-thermalizing quantum states in a controllable system.
  • To investigate the encoding of quantum information in far-from-equilibrium states.
  • To explore the role of non-ergodic behavior in quantum state engineering.

Main Methods:

  • Utilized a custom-built superconducting qubit ladder.
  • Implemented quench dynamics to probe state fidelity and entanglement entropy.
  • Leveraged the "rainbow scar" phenomenon for analytically exact eigenfunction control.
  • Employed disorder in couplings to tune quantum correlations and ergodicity breaking.

Main Results:

  • Successfully realized non-thermalizing states with complex entanglement structures.
  • Demonstrated robust quantum information encoding in these states, even at effective infinite temperature.
  • Showcased on-demand tunability of quantum correlations and ergodicity breaking via disorder.
  • Identified a method to design many-body states that resist thermalization.

Conclusions:

  • Superconducting qubit systems can host exotic non-thermalizing states.
  • Rainbow scar physics provides a mechanism for controlling ergodicity breaking.
  • Tunable quantum correlations offer a pathway to engineer novel quantum states.
  • This work advances the design principles for quantum technologies that operate far from equilibrium.