Entanglement persistence in contact with the environment: exact results
Jerzy Dajka, Marcin Mierzejewski, J. Łuczka · Journal of Physics A Mathematical and Theoretical · 2007
The evolution of quantum entanglement of a pair of non-interacting qubits is studied for the case where one of them is non-dissipatively but dephasingly coupled to the environment. The reduced non-Markovian dynamics of the qubits is exact for an arbitrary strength of coupling to the environment and the arbitrary frequency spectrum of environment fluctuations. While for the subohmic and ohmic environments the entanglement diminishes, for the superohmic zero-temperature environment it survives for a long time.