title: Disentanglement versus decoherence of two qubits in thermal noise.
abstract: We show that the influence of thermal noise, simulated by a 2D ferromagnetic Ising spin lattice on a pair of noninteracting, initially entangled qubits, represented by quantum spins, leads to unexpected evolution of quantum correlations. The high temperature noise leads to ultraslow decay of the quantum correlations. Decreasing the noise temperature we observe a decrease of the characteristic decay time scale. When the noise originates from a critical state, a revival of the quantum correlations is observed. This revival becomes oscillatory with a slowly decaying amplitude when the temperature is decreased below the critical region, leading to persistence of the quantum correlations.
authors.affiliation: Department of Physics, University of Athens, Athens, Greece.
authors.forename: A V
authors.initials: AV
authors.lastname: Zampetaki
authors.forename: F K
authors.initials: FK
authors.lastname: Diakonos