Ali, TibraTibraAliBhattacharyya, ArpanArpanBhattacharyyaHaque, S. ShajidulS. ShajidulHaqueKim, Eugene H.Eugene H.KimMoynihan, NathanNathanMoynihanMurugan, JeffJeffMurugan2025-08-312025-08-312020-01-1510.1103/PhysRevD.101.0260212-s2.0-85079743234https://d8.irins.org/handle/IITG2025/24246We propose a new diagnostic for quantum chaos. We show that the time evolution of complexity for a particular type of target state can provide equivalent information about the classical Lyapunov exponent and scrambling time as out-of-time-order correlators. Moreover, for systems that can be switched from a regular to unstable (chaotic) regime by a tuning of the coupling constant of the interaction Hamiltonian, we find that the complexity defines a new time scale. We interpret this time scale as recording when the system makes the transition from regular to chaotic behavior.trueArticlehttps://journals.aps.org/prd/pdf/10.1103/PhysRevD.101.0260212470002915 January 202094026021arJournal93WOS:000510151400006