Quantum mutual information as a robust probe of integrability in open quantum systems
A new tool for telling orderly from chaotic quantum systems that actually works with noise
Physicists have found a new way to tell whether a quantum system behaves in an orderly, predictable way or descends into chaos — and it works even when the system is exposed to environmental noise. The approach, based on measuring quantum correlations between particles, outperforms the standard method in certain noisy conditions, especially when the noise has a memory effect that lets quantum information leak back into the system.
Understanding whether quantum systems are orderly or chaotic determines how well we can control them and predict their behavior — critical for quantum computers and quantum sensors. Current methods for making this distinction break down when real-world noise enters the picture, but this new approach keeps working in some realistic noise scenarios, making it more practical for distinguishing system types in actual experiments and devices.