pairs as the light source. Later, using a chaotic radiation or pseudo-thermal light source, a 50% contrast
ghost image of the object was observed in terms of coincidences between the CCD and a bucket detector
that receives the scattered and reflected photons from the object [2]. In 2004, Gatti et al. demonstrated
speckle-to-speckle classical correlation between two distant planes to image the speckles of the source onto
both the object and ghost-image planes [3]. In 2005, Zhang et al. demonstrated an experiment of two-photon
correlated imaging with true thermal light from a hollow cathode lamp [4]. In this paper, we wish to report
first experimental demonstration on two-photon ghost imaging using the Sun as a light source for field imaging applications.
References
1. T.B. Pittman, Y.H. Shih, D.V. Strekalov, and A.V. Sergienko, Phys. Rev. A52, R3429 (1995).
2. A. Valencia, G. Scarcelli, M. D'Angelo, Y. H. Shih, , Phys. Rev. Lett.94, 063601 (2005); G. Scarcelli, V. Berardi, Y. H.
Shih, Phys. Rev. Lett.96, 063602(2006); R. Meyers, K. S. Deacon, Y. H. Shih, Phys. Rev. A77, 041801(2008); Y. Shih,
SPIE News, Electronic Imaging and Signal Processing, July, (2009).
3. A. Gatti, E. Brambilla, M. Bache, L. A. Lugiato, Phys. Rev. Lett.93, 093602(2004); Phys. Rev. A70, 013802(2004).
4. D. Zhang, Y. Zhai, L. Wu, X. Chen, Optics Letters30, 2354(2005).
