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Quantum Many-Body Scars beyond the PXP Model in Rydberg Simulators.

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Quantum many-body scars (QMBSs) are found in new models generalizing the PXP model. These QMBSs exhibit oscillatory dynamics and require specific initial states for observation in Rydberg atom simulators.

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Area of Science:

  • Quantum physics
  • Many-body systems
  • Atomic physics

Background:

  • Quantum many-body scars (QMBSs) are non-thermal eigenstates in quantum Hamiltonians.
  • QMBSs have been observed in Rydberg atom simulators, particularly in the PXP model.
  • The prevalence and physical realization of QMBSs in diverse models remain active research areas.

Purpose of the Study:

  • To investigate the existence and properties of QMBSs in a broader class of models beyond the PXP model.
  • To generalize the concept of QMBSs to include longer-range interactions and different periodicities.
  • To explore the conditions for observing QMBSs in these generalized models.

Main Methods:

  • Theoretical investigation of generalized models incorporating longer-range constraints.
  • Analysis of approximate su(2) algebras associated with different QMBS families.
  • Simulation of quantum dynamics initiated from various initial states, including weakly entangled ones.

Main Results:

  • QMBSs are demonstrated to exist in a broader family of models that generalize the PXP model.
  • Multiple families of QMBSs, each linked to a distinct approximate su(2) algebra, are identified.
  • Oscillatory dynamics characteristic of QMBSs are observed across these models.
  • Observation of QMBSs in these generalized models necessitates weakly entangled initial states, unlike the PXP model.

Conclusions:

  • QMBSs are more common than previously thought, existing in a wider range of physical models.
  • The findings provide a theoretical framework for exploring QMBSs in systems with longer-range interactions.
  • Experimental verification of these QMBSs is feasible using Rydberg atom simulators with longer-range Rydberg blockades.