Positive-negative turbulence-free ghost imaging

This experiment observed turbulence-free positive and negative thermal light ghost images from independently recorded event histories of a bucket photo-detector and a charged coupled device (CCD) array. The positive (negative) ghost image is computed from the bucket detector counts which are above (below) its mean, and the ghost image is not degraded by the turbulence. How do the bucket photon counts yield a positive or negative ghost image with a distant CCD array? This letter provides a quantum interference model which effectively explains the phenomenon. VC 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3698158]