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Dynamical Transition Due to Feedback-Induced Skin Effect.

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Summary
This summary is machine-generated.

We discovered a new dynamical transition in monitored free fermion systems, shifting from logarithmic to area-law scaling of entanglement entropy due to competing bulk and boundary effects.

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Area of Science:

  • Quantum physics
  • Condensed matter theory
  • Many-body dynamics

Background:

  • Dynamical phase transitions typically involve singularities in observables or the Loschmidt echo rate function.
  • Understanding transitions in monitored quantum systems is crucial for quantum information science.

Purpose of the Study:

  • Investigate novel dynamical transitions in continuously monitored free fermion systems with feedback.
  • Characterize the transition from logarithmic to area-law scaling of entanglement entropy.

Main Methods:

  • Studied many-body dynamics of a free fermion system under continuous monitoring and conditional feedback.
  • Analyzed entanglement entropy scaling under open boundary conditions.
  • Investigated the effect of quasidisorder and disorder on steady-state and time-evolved entanglement.

Main Results:

  • Identified a novel dynamical transition from logarithmic to area-law scaling of entanglement entropy.
  • This transition arises from the interplay between bulk dynamics and boundary skin effects.
  • Quasidisorder or disorder does not induce a steady-state transition but leads to a transition in maximum entanglement entropy during time evolution.

Conclusions:

  • The observed transition differs from conventional dynamical phase transitions.
  • The findings highlight the role of boundary effects and monitoring in driving quantum phase transitions.
  • The study provides insights into entanglement dynamics in open quantum systems.