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Solomon, Allan I. and Schirmer, Sonia G.
(2002).
URL: http://xxx.soton.ac.uk/abs/quant-ph/0211027
Abstract
We show that a quantum control procedure on a two-level system including dissipation gives rise to a semi-group corresponding to the Lie algebra semi-direct sum gl(3,R)+R^3. The physical evolution may be modelled by the action of this semi-group on a 3-vector as it moves inside the Bloch sphere, in the Bloch ball.