A groundbreaking study explores how entropy increases in isolated quantum systems, demonstrating that the second law of thermodynamics emerges when observing these systems through specific measurements despite their underlying reversible evolution. The researchers develop novel mathematical bounds proving that entropy tends toward equilibrium values, while also showing that quantum systems don't necessarily require non-integrability for equilibration.
https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.6.010309