[2] The first demonstration of ghost imaging, performed by T. B. Pittman, Y. H. Shih, D. V. Strekalov, and A. V. Sergienko in 1995, was based on quantum correlations between entangled photon pairs.
In 2009 'pseudothermal ghost imaging' and 'ghost diffraction' were demonstrated by implementing the 'computational ghost-imaging' scheme,[5] which relaxed the need to evoke quantum correlations arguments for the pseudothermal source case.
The U.S. Army Research Laboratory (ARL) developed remote ghost imaging in 2007 with the goal of applying advanced technology to the ground, satellites and unmanned aerial vehicles.
Next, shine laser light into a beamsplitter and reflect the two resulting beams such that each passes through the same part of its respective box at the same time.
Also, the correct image can be recorded using only the single beam passing through a computer-controlled light modulator to a single-pixel detector.
In a paper published February 10, 2012, the team outlined their feasibility study of virtual ghost imaging using the Bessel beam, to address adverse conditions with limited visibility, such as cloudy water, jungle foliage, or around corners.
[13] The spontaneous parametric down-conversion (SPDC) process provides a convenient source of entangled-photon pairs with strong spatial correlations.
[14] Such heralded single photons can be used to achieve a high signal-to-noise ratio, virtually eliminating background counts from the recorded images.
The image data are recorded from the coincidently detected, position-correlated, visible photons with a wavelength of 460 nm using a highly efficient, low-noise, photon-counting camera.