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Many-Body Dephasing in a Trapped-Ion Quantum Simulator.

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This summary is machine-generated.

We observed persistent temporal fluctuations in a quantum many-body system after a quantum quench. Our findings align with theoretical predictions for many-body dephasing, showing fluctuations decrease with system size.

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Area of Science:

  • Thermodynamics
  • Statistical Physics
  • Quantum Many-Body Systems

Background:

  • Understanding relaxation and dephasing in closed interacting quantum systems is crucial.
  • Quantum quenches probe non-equilibrium dynamics.

Purpose of the Study:

  • To analyze and observe persistent temporal fluctuations after a quantum quench.
  • To investigate many-body dephasing in a tunable long-range interacting transverse-field Ising Hamiltonian.

Main Methods:

  • Utilized a trapped-ion quantum simulator to realize the Hamiltonian.
  • Measured temporal fluctuations in average magnetization of a spin-1/2 system.
  • Compared experimental data with analytical predictions for integrable and nonintegrable dynamics.

Main Results:

  • Observed persistent temporal fluctuations in magnetization.
  • Found experimental data consistent with theoretical predictions.
  • Demonstrated exponential suppression of fluctuations with increasing system size.

Conclusions:

  • The study confirms a regime of many-body dephasing.
  • Trapped-ion quantum simulators are effective for studying non-equilibrium quantum dynamics.
  • Results provide insights into fundamental questions of relaxation in quantum systems.