Time: 10:00-12:00, June 1, 2026

Location: Seminar Room of KITS, UCAS

Speaker: Xianlong Liu (Shanghai Jiaotong Univ)

Abstract:

Continuous monitoring is usually expected to suppress quantum coherence and weaken many-body quantum chaos. In this talk, I will discuss a counterexample in an open Sachdev-Ye-Kitaev system coupled to both a thermal bath and a Markovian monitoring environment. By solving the non-equilibrium dynamics using Kadanoff-Baym and Schwinger-Dyson equations, we find that the competition between thermal dissipation and monitoring drives the system to a unique non-thermal steady state, independent of the initial state. The retarded Green’s function displays a two-stage exponential decay, reflecting the distinct roles of the bath and the monitoring. Most strikingly, continuous monitoring can induce or enhance quantum chaotic dynamics, as diagnosed by the Lyapunov exponent. In particular, chaos suppressed by the thermal bath can reappear when monitoring is turned on. These results suggest that measurement and thermal dissipation can be used not only to destroy, but also to control, quantum scrambling in many-body systems.