Rényi entanglement entropy after a quantum quench starting from insulating states in a free boson system
arXiv:2207.08353 · doi:10.1103/PhysRevA.107.033305
Abstract
We investigate the time-dependent Rényi entanglement entropy after a quantum quench starting from the Mott-insulating and charge-density-wave states in a one-dimensional free boson system. The second Rényi entanglement entropy is found to be the negative of the logarithm of the permanent of a matrix consisting of time-dependent single-particle correlation functions. From this relation and a permanent inequality, we obtain rigorous conditions for satisfying the volume-law entanglement growth. We also succeed in calculating the time evolution of the Rényi entanglement entropy in unprecedentedly large systems by brute-force computations of the permanent. We discuss possible applications of our findings to the real-time dynamics of noninteracting bosonic systems.
arXiv comment15 pages, 8 figures. The authors Daichi Kagamihara and Ryui Kaneko contributed equally to this work
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