Abstract
Two noninteracting qubits are coupled to an environment. Both coupling and environment are chosen as random matrices to obtain generic results. The initial state of the pair ranges from a Bell state to a product state. Decoherence of the pair is evaluated analytically in terms of purity; Monte Carlo calculations confirm these results and also yield concurrence of the pair. Entanglement within the pair accelerates decoherence. Numerics displays the relation between concurrence and purity known for Werner states. A closed albeit heuristic formula for concurrence decay ensues.
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