Long-lived spin entanglement induced by a spatially correlated thermal   bath
  We investigate how two spatially separated qubits coupled to a common heat bath can be entangled by purely dissipative dynamics. We identify a dynamical time scale associated with the lifetime of the dissipatively generated entanglement and show that it can be much longer than either the typical single-qubit decoherence time or the time scale on which a direct exchange interaction can entangle the qubits. We give an approximate analytical expression for the long-time evolution of the qubit concurrence and propose an ion trap scheme in which such dynamics should be observable. 
Dara P. S. McCutcheon, Ahsan Nazir, Sougato Bose, Andrew J. Fisher