Observing the Quantum Mpemba Effect in Quantum Simulations

Area of Science:

• Quantum physics
• Nonequilibrium thermodynamics
• Many-body systems

Background:

• Nonequilibrium quantum systems exhibit unusual behaviors.
• The quantum Mpemba effect is a puzzling phenomenon where systems recover symmetry faster when further from equilibrium.

Purpose of the Study:

• To experimentally investigate the quantum Mpemba effect.
• To provide the first experimental evidence in a trapped-ion quantum simulator.

Main Methods:

• Utilizing a trapped-ion quantum simulator.
• Monitoring symmetry breaking and restoration via entanglement asymmetry.
• Employing randomized measurements and classical shadows for data processing.
• Measuring Frobenius distance to a theoretical thermal state.

Main Results:

• First experimental demonstration of the quantum Mpemba effect in a trapped-ion system.
• Observed faster symmetry restoration when farther from the symmetric state.
• Confirmed subsystem thermalization through state distance measurements.

Conclusions:

• The quantum Mpemba effect is experimentally verified in a controllable quantum system.
• Findings offer insights into the dynamics of quantum systems far from equilibrium.
• Demonstrates the utility of trapped-ion simulators for studying fundamental quantum phenomena.