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Measurement Quench in Many-Body Systems.

Abolfazl Bayat1,2, Bedoor Alkurtass2,3, Pasquale Sodano4

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Quantum measurements can induce dynamics in many-body systems without altering their Hamiltonian. This novel approach simplifies quench implementation and enhances resilience against decoherence, offering advantages for spectroscopy and probing critical systems.

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Area of Science:

  • Quantum physics
  • Many-body systems
  • Quantum measurement theory

Background:

  • Measurement fundamentally differs between classical and quantum physics.
  • Quantum measurements typically cause irreversible wave function collapse.
  • Inducing controlled dynamics (quenches) in quantum systems is crucial for research.

Purpose of the Study:

  • To propose a novel method for inducing quench dynamics in many-body systems.
  • To leverage quantum measurement's inherent disturbance for controlled system evolution.
  • To reduce reliance on external macroscopic devices for initiating quantum quenches.

Main Methods:

  • Utilizing the wave function collapse inherent in quantum measurement.
  • Applying measurement protocols to many-body quantum systems.
  • Analyzing the induced dynamics through case studies.

Main Results:

  • Demonstrated a method to induce quench dynamics solely through measurement.
  • Showcased enhanced resilience against decoherence compared to traditional methods.
  • Identified advantages for spectroscopy and probing nonequilibrium phenomena.

Conclusions:

  • Quantum measurements offer a viable and robust tool for inducing controlled dynamics in many-body systems.
  • This measurement-based quench protocol simplifies experimental implementation.
  • The method provides new avenues for exploring quantum critical and impurity systems.