title: Non-equilibrium quantum phase transition via entanglement decoherence dynamics.
abstract: We investigate the decoherence dynamics of continuous variable entanglement as the system-environment coupling strength varies from the weak-coupling to the strong-coupling regimes. Due to the existence of localized modes in the strong-coupling regime, the system cannot approach equilibrium with its environment, which induces a nonequilibrium quantum phase transition. We analytically solve the entanglement decoherence dynamics for an arbitrary spectral density. The nonequilibrium quantum phase transition is demonstrated as the system-environment coupling strength varies for all the Ohmic-type spectral densities. The 3-D entanglement quantum phase diagram is obtained.
authors.affiliation: Department of Physics and Centre for Quantum Information Science, National Cheng Kung University, Tainan 70101, Taiwan.
authors.forename: Yu-Chen
authors.initials: YC
authors.lastname: Lin
authors.affiliation: Department of Physics and Centre for Quantum Information Science, National Cheng Kung University, Tainan 70101, Taiwan.
authors.forename: Pei-Yun
authors.initials: PY
authors.lastname: Yang
authors.affiliation: Department of Physics and Centre for Quantum Information Science, National Cheng Kung University, Tainan 70101, Taiwan.
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Zhang