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Area of Science:

  • Quantum Physics
  • Thermodynamics
  • Non-Hermitian Physics

Background:

  • The Mpemba effect describes counterintuitive faster cooling of initially heated water.
  • Understanding and utilizing this effect in quantum systems is a significant challenge.
  • Initial conditions critically influence relaxation processes.

Purpose of the Study:

  • To experimentally investigate the Mpemba effect in a single trapped ion system.
  • To explore strategies for accelerating relaxation in open quantum systems.
  • To establish a connection between the Mpemba effect and non-Hermitian physics.

Main Methods:

  • Experimental realization of the Mpemba effect in a single trapped ion.
  • Preparation of an optimal quantum initial state to avoid exciting the slowest decaying mode.
  • Analysis of system dynamics and identification of Liouvillian exceptional points.

Main Results:

  • Observed a strong Mpemba effect with exponentially accelerated relaxation.
  • Demonstrated that the effect's conditions coincide with Liouvillian exceptional points.
  • Showcased the coalescence of eigenvalues and eigenmodes at these points.

Conclusions:

  • The study provides an efficient strategy for engineering open quantum system dynamics.
  • A novel link between the Mpemba effect and non-Hermitian physics has been suggested.
  • The findings open new avenues for controlling quantum relaxation processes.