An exactly solvable model for the dynamics of two spin-1/2 particles embedded in separate spin star environments

Abstract

Exact analytical results for the dynamics of two interacting qubits, each of which is embedded in its own spin star bath, are presented. The time evolution of the concurrence and the purity of the two-qubit system are investigated for finite and infinite numbers of environmental spins. The effect of qubit-qubit interactions on the steady state of the central system is investigated. © 2009 IOP Publishing Ltd.