Abstract
Although classical models of feedback schemes have been used for a long time to control dynamical noise, an analogous quantum theory of feedback has been developed only in the last fifteen years.1-7 Recently there has been considerable interest in quantum feedback as a way to fight decoherence in isolated quantum systems, using the approach of Refs.4-5 For example, it has been suggested as a way to create optical squeezed states,8 to create micromaser number states,9 to correct errors in quantum bits,10 and to protect optical and microwave Schrodinger cat states against dissipation.11-13
© 2001 Optical Society of America
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