Added noise in homodyne measurement of field-observables

Giacomo M. D'Ariano; Italy); Matteo G. A. Paris (Dipartimento di Fisica 'Alessandro Volta'; Pavia

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Added noise in homodyne measurement of field-observables

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arxiv quant-ph/9704034 v1 pith:SAQKL7EF submitted 1997-04-17 quant-ph

Giacomo M. D'Ariano , Matteo G. A. Paris (Dipartimento di Fisica 'Alessandro Volta' , Pavia , Italy) This is my paper

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Homodyne tomography provides a way for measuring generic field-operators. Here we analyze the determination of the most relevant quantities: intensity, field, amplitude and phase. We show that tomographic measurements are affected by additional noise in comparison with the direct detection of each observable by itself. The case of of coherent states has been analyzed in details and earlier estimations of tomographic precision are critically discussed.

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