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Paper detail

Measuring quantum state overlaps of traveling optical fields

We propose a detection scheme for measuring the overlap of the quantum state of a weakly excited traveling-field mode with a desired reference quantum state, by successive mixing the signal mode with modes prepared in coherent states and performing photon-number measurements in an array of beam splitters. To illustrate the scheme, we discuss the measurement of the quantum phase and the detection of Schrodinger-cat-like states.

preprint1999arXivOpen access
J. ClausenM. DaknaL. KnollD. -G. Welsch
quant-ph
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J. ClausenM. DaknaL. KnollD. -G. Welsch

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