Unified Theory of Ghost Imaging with Gaussian-State Light

Details Unified Theory of Ghost Imaging with Gaussian-State Light Unified Theory of Ghost Imaging with Gaussian-State Light

2007-12-20

arxiv.org/abs/0712.3554v1

Physics

Quantum Physics

14 pages, 4 figures

Scientific paper

10.1103/PhysRevA.77.043809

The theory of ghost imaging is developed in a Gaussian-state framework that both encompasses prior work - on thermal-state and biphoton-state imagers - and provides a complete understanding of the boundary between classical and quantum behavior in such systems. The core of this analysis is the expression derived for the photocurrent-correlation image obtained using a general Gaussian-state source. This image is expressed in terms of the phase-insensitive and phase-sensitive cross-correlations between the two detected fields, plus a background. Because any pair of cross-correlations is obtainable with classical Gaussian states, the image does not carry a quantum signature per se. However, if the image characteristics of classical and nonclassical Gaussian-state sources with identical auto-correlation functions are compared, the nonclassical source provides resolution improvement in its near field and field-of-view improvement in its far field.

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