  Werner states are defined as bipartite qudit states that remain unchanged
under application of arbitrary unitary operators acting on both subsystems
simultaneously. Their preparation is a crucial ingredient in entanglement
distillation protocols. This thesis deals with an iterative approach to prepare
Werner states asymptotically, using random unitary operations. The asymptotic
dynamics of random unitary operations are linked to algebraic properties of the
involved unitary operators applying results about general quantum operations.
Then a family of random unitary operations is constructed, which prepares
Werner states asymptotically for an arbitrary finite dimensional bipartite
qudit system. Finally, this construction is applied in qubit and qudrit
systems, where the convergence rate is optimized numerically.

Quantum Physics