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Enhancing Revivals via Projective Measurements in a Quantum Scarred System
Alessio Paviglianiti1, Alessandro Silva1
1International School for Advanced Studies (SISSA), via Bonomea 265, 34136 Trieste, Italy.
Physical Review Letters
|September 15, 2025
Summary
Projective measurements can disrupt or enhance quantum many-body scarred systems
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.
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