Subsystem complexity after a global quantum quench

A bstract We study the temporal evolution of circuit complexity for a subsystem in harmonic lattices after global quantum quench mass parameter, choosing initial reduced density matrix as reference state. Upper and lower bounds are derived entire system. The is evaluated by employing Fisher information geometry covariance matrices. discuss numerical results evolutions block consecutive sites chains with either periodic or Dirichlet boundary conditions, comparing them entanglement entropy. For infinite chains, asymptotic value studied through generalised Gibbs ensemble.