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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Many-body localization

Background:

  • Discrete time crystals (DTCs) are exotic phases of matter exhibiting periodic behavior in time.
  • Existing DTC models often require significant disorder and averaging, complicating experimental realization.
  • Many-body localization (MBL) is crucial for stabilizing quantum systems against thermalization.

Purpose of the Study:

  • To propose a novel, disorder-free model for discrete time crystals.
  • To investigate the stabilization mechanism of DTCs by Stark many-body localization (MBL).
  • To explore the potential for realizing DTCs on near-term quantum devices.

Main Methods:

  • Analytical investigation using perturbation theory.
  • Numerical simulations of observable dynamics.
  • Characterization of the Stark-MBL DTC phase.

Main Results:

  • A simple, disorder-free model exhibiting a discrete time crystal phase is presented.
  • The DTC phase is shown to be stabilized by Stark many-body localization (MBL).
  • The model demonstrates robust subharmonic responses and novel beating oscillations.

Conclusions:

  • The proposed disorder-free DTC model simplifies experimental realization, particularly on noisy intermediate-scale quantum (NISQ) hardware.
  • This work deepens the understanding of DTCs and their stabilization mechanisms.
  • The novel oscillations observed offer new avenues for exploring quantum phenomena in MBL systems.