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Study on quantum thermalization from thermal initial states in a superconducting quantum computer.

Marc Espinosa Edo1,2, Lian-Ao Wu3,4,5

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Researchers developed a new protocol to study quantum thermalization dynamics using pure states, overcoming challenges in preparing thermal states in quantum computers. Experimental results showed unusual relaxation, offering a novel approach to quantum physics research.

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Area of Science:

  • Quantum physics
  • Quantum computing
  • Quantum information science

Background:

  • Quantum thermalization is crucial for quantum computers but difficult to achieve experimentally.
  • Preparing thermal states in quantum systems presents significant challenges.

Purpose of the Study:

  • To propose and experimentally validate a protocol for indirectly studying quantum thermalization dynamics.
  • To enable the investigation of thermal state dynamics using only pure states.

Main Methods:

  • Development of a novel protocol utilizing pure states for indirect study of thermalization.
  • Experimental validation on IBM quantum devices.
  • Assessment of the Quantum Mpemba Effect (QME) formalism.

Main Results:

  • Demonstration of unusual relaxation dynamics in equidistant quenches.
  • Experimental validation of the proposed protocol on quantum hardware.
  • No unusual behavior observed for the Quantum Mpemba Effect, consistent with theory.

Conclusions:

  • The protocol provides a viable alternative for studying thermalization physics when direct preparation is infeasible.
  • The findings open new avenues for experimental investigations in quantum thermalization.
  • The study highlights the potential of pure states to probe complex quantum phenomena.