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Area of Science:

  • Quantum physics
  • Thermodynamics
  • Open quantum systems

Background:

  • The Mpemba effect describes faster relaxation from a hotter initial state.
  • In quantum systems, coherent dynamics and dissipation introduce complexities.
  • Metastable states can lead to long-lived Liouvillian modes.

Purpose of the Study:

  • To demonstrate a giant Mpemba effect in open quantum systems.
  • To explore how initial states influence relaxation dynamics.
  • To engineer ultrafast relaxation in quantum networks.

Main Methods:

  • Focusing on weakly-coupled particle-conserving bosonic networks.
  • Introducing weak coherent interactions to the system.
  • Tailoring the interaction Hamiltonian to suppress slow modes.

Main Results:

  • Observed hyper-acceleration or dramatic slowing of relaxation.
  • Demonstrated suppression of slow metastable modes for specific initial states.
  • Achieved ultrafast relaxation by engineering the system's Hamiltonian.

Conclusions:

  • A general mechanism for engineering giant Mpemba effects in open quantum systems is presented.
  • This offers new possibilities for controlling dissipative dynamics and accelerating state preparation.
  • The findings have implications for manipulating relaxation processes in quantum devices.