Quantum fluctuations are fundamental in many-body physics, often altering the nature of quantum phases beyond mean-field predictions. In this work, we explore their impact on a spatial-temporal ordered phase in a cavity-boson system, a phase previously predicted within the mean-field framework. By incorporating higher-order quantum fluctuations of the cavity field, we derive a set of quantum kinetic equations and numerically analyze the system's dynamics. Our results show that while mean-field spatial-temporal order vanishes over time, oscillatory behavior persists at the level of quantum fluctuations, demonstrating that the phase survives in a modified form. This study underscores the importance of quantum fluctuations in nonequilibrium quantum systems and reveals the limitations of the mean-field approach in predicting the stability of complex quantum phases.

Close

PrevNext

View figure in article

• Cavity quantum electrodynamics
• Cold atoms & matter waves
• Open quantum systems
• Ultracold gases