Measurement Quench in Many-Body Systems

Area of Science:

• Quantum physics
• Many-body systems
• Quantum measurement theory

Background:

• Measurement fundamentally differs between classical and quantum physics.
• Quantum measurements typically cause irreversible wave function collapse.
• Inducing controlled dynamics (quenches) in quantum systems is crucial for research.

Purpose of the Study:

• To propose a novel method for inducing quench dynamics in many-body systems.
• To leverage quantum measurement's inherent disturbance for controlled system evolution.
• To reduce reliance on external macroscopic devices for initiating quantum quenches.

Main Methods:

• Utilizing the wave function collapse inherent in quantum measurement.
• Applying measurement protocols to many-body quantum systems.
• Analyzing the induced dynamics through case studies.

Main Results:

• Demonstrated a method to induce quench dynamics solely through measurement.
• Showcased enhanced resilience against decoherence compared to traditional methods.
• Identified advantages for spectroscopy and probing nonequilibrium phenomena.

Conclusions:

• Quantum measurements offer a viable and robust tool for inducing controlled dynamics in many-body systems.
• This measurement-based quench protocol simplifies experimental implementation.
• The method provides new avenues for exploring quantum critical and impurity systems.