Bhattacharyya, ArpanArpanBhattacharyyaHaque, S. ShajidulS. ShajidulHaqueKim, Eugene H.Eugene H.Kim2025-08-222025-08-222020-11-012331-8422https://arxiv.org/abs/2011.04705https://d8.irins.org/handle/IITG2025/18378We investigate circuit complexity to characterize chaos in multiparticle quantum systems; concomitantly, we take strides in using complexity to characterize open quantum systems. By exploring different types of quantum circuits, we propose a new diagnostic of chaos from complexity based on the reduced density matrix. Through explicit calculations on a model of two coupled harmonic oscillators where one or both of the oscillators are inverted, we demonstrate that the evolution of complexity is an effective diagnostic of chaos.en-USChaotic DynamicsHigh EnergyQuantum Physicse-Printe-Print123456789/615