Publication: Fisher information as a generalized measure of coherence in classical and quantum optics
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2012-10-22
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The Optical Society Of America
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Abstract
We show that metrological resolution in the detection of small phase shifts provides a suitable generalization of the degrees of coherence and polarization. Resolution is estimated via Fisher information. Besides the standard two-beam Gaussian case, this approach provides also good results for multiple field components and nonGaussian statistics. This works equally well in quantum and classical optics.
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© 2012 OSA. This work has been supported by Project No. FIS2008-01267 of the Spanish Direccion General de Investigacion del Ministerio de Ciencia e Innovacion, and from Project QUITEMAD S2009-ESP-1594 of the Consejeria de Educacion de la Comunidad de Madrid. I thank the anonymous reviewers for one of the demonstrations in Appendix A and other useful suggestions.
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