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Related Experiment Video

Updated: Dec 30, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Feedback-Induced Quantum Phase Transitions Using Weak Measurements.

D A Ivanov¹, T Yu Ivanova¹, S F Caballero-Benitez²

¹Department of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia.

Physical Review Letters

|January 25, 2020

Summary

This summary is machine-generated.

Feedback and weak quantum measurements drive novel phase transitions, allowing control over quantum properties like critical exponents. This research explores new frontiers in quantum system control and simulation.

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Area of Science:

Quantum Physics
Quantum Information Science

Background:

Dissipative phase transitions are well-understood phenomena in quantum systems.
Controlling quantum properties like critical exponents has been a significant challenge.

Purpose of the Study:

To investigate the effects of feedback and weak measurements on quantum phase transitions.
To demonstrate the ability to control quantum properties of phase transitions.

Main Methods:

Applying feedback protocols to quantum systems.
Utilizing weak quantum measurements.
Analyzing the resulting non-Markovian and nonlinear dynamics.

Main Results:

Induced phase transitions beyond standard dissipative ones.
Control over the critical exponent of the transition.
Simulation of spin-bath and Floquet time crystal effects with tunable long-range interactions.

Conclusions:

Feedback and weak measurements offer a powerful toolkit for engineering quantum phase transitions.
This approach enables the simulation of complex quantum phenomena previously inaccessible.