Abstract
Traditional ghost imaging experiments exploit position correlations between correlated states of light. These correlations occur directly in spontaneous parametric down-conversion, and in such a scenario, the two-photon state usually used for ghost imaging is symmetric. Here we perform ghost imaging using an anti-symmetric state, engineering the two-photon state symmetry by means of Hong–Ou–Mandel interference. We use both symmetric and anti-symmetric states and show that the ghost imaging setup configuration results in object-image rotations depending on the state selected. Further, the object and imaging arms employ spatial light modulators for the all-digital control of the projections, being able to dynamically change the measuring technique and the spatial properties of the states under study. Finally, we provide a detailed theory that explains the reported observations.
Highlights
Ghost imaging was first performed by Pittman et al [1], in which entanglement was utilized as the source of spatial correlations between a pair of separate photons
The first ghost imaging tests made use of entanglement as the source of spatial correlations, such as those arising from the spontaneous parametric downconversion (SPDC) process [2]
Ghost imaging has been observed in various degrees of freedom (DoF), such as the orbital angular momentum of light [11], correlations in the time domain [12], in momentum-position [13] and spectral DoF [14]. 3D ghost images have been reconstructed using singlepixel detectors [15], and ghost imaging has even been studied in the presence of turbulence [16]
Summary
Ghost imaging was first performed by Pittman et al [1], in which entanglement was utilized as the source of spatial correlations between a pair of separate photons. One photon of the pair interacts with an arbitrary object and is collected with a bucket detector with no spatial resolution. The concept of ghost imaging was extended to entanglement swapped photons, demonstrating ghost imaging with initially independent photons [19]. In this case the role of state symmetry was crucial to the outcome of the object/image contrast
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