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Retrodiction as a tool for micromaser field measurements

Jeffers, J. and Barnett, S.M. and Pegg, D.T. (2002) Retrodiction as a tool for micromaser field measurements. Journal of Modern Optics, 49 (5-6). pp. 925-938. ISSN 0950-0340

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We use retrodictive quantum theory to describe cavity field measurements by successive atomic detections in the micromaser. We calculate the state of the micromaser cavity field prior to detection of sequences of atoms in either the excited or ground state, for atoms that are initially prepared in the excited state. This provides the POM elements, which describe such sequences of measurements.