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Studying entanglement entropy in quantum many body systems has become interesting for quantum information science, where entanglement is the main source of speed-up in quantum computers, and for condensed matter theory, due to its role as a non-classical correlation in quantum phase transitions (for a recent review, see [1]).
In earlier publications the entanglement between a localized spin and a bosonic bath has been studied [2,3]. Here we investigate characteristic time-scales where the quantum impurity system becomes entangled, as well as universality of the short-time dynamics. Specifically we analyze the real-time dynamics of entanglement entropy in the anisotropic Kondo model, applying a time-dependent Numerical Renormalization Group (NRG) algorithm [4]. [1] L. Amico, R. Fazio, A. Osterloh, and V. Vedral, quant-phys/0703044. [2] K. Le Hur, P. Doucet-Beaupre, and W. Hofstetter, Phys. Rev. Lett. 99, 126801 (2007). [3] A. Kopp, and K. Le Hur, Phys. Rev. Lett. 98, 220401 (2007). [4] F. Anders, and A. Schiller, Phys. Rev. Lett. 95, 196801 (2005). |
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