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Projective measurements can disrupt or enhance quantum many-body scarred systems

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum dynamics

Background:

  • Quantum many-body scarred systems exhibit unusual dynamics, avoiding thermalization and showing periodic state revivals.
  • These systems are crucial for understanding quantum chaos and information scrambling.

Purpose of the Study:

  • Investigate the impact of projective measurements on quantum many-body scarred systems dynamics.
  • Explore how measurements influence periodic state revivals in the PXP model.

Main Methods:

  • Studied the paradigmatic PXP model.
  • Applied local projective measurements at random and periodic times.
  • Analyzed the dynamics within the scar subspace.

Main Results:

  • Random local measurements rapidly destroy system memory, leading to thermalization.
  • Periodic monitoring amplifies recurrences and preserves coherent dynamics over long periods.
  • Identified measurement-induced phase resynchronization as the key mechanism.

Conclusions:

  • Projective measurements offer a powerful tool to control quantum dynamics in scarred systems.
  • Periodic measurements can counteract dephasing and sustain quantum revivals, offering new avenues for quantum control.