Utilizing quantum light to enhance imaging has been a topic of considerable current interest, much of it involving biphotons, i.e., streams of entangled-photon pairs. The quantum optics of squeezed-state generation, however, depends on nonlinear interactions producing baseband field operators with phase-insensitive and phase-sensitive correlations. the vast majority of this work addresses fields that are statistically stationary in time, hence their complex envelopes only have phase-insensitive correlations. The theory of partial coherence has a long and storied history in classical statistical optics. Phase-Sensitive Coherence and the Classical- Quantum Boundary in Ghost ImagingĮrkmen, Baris I. Our analysis thus casts doubt on the degree to which quantum discord is necessary for ghost imaging. We show that quantum discord plays no role in spatial light modulator ghost imaging, i.e., ghost-image formation based on structured illumination realized with laser light that has undergone spatial light modulation by the output from a pseudorandom number generator. Ragy and Adesso argue that quantum discord is involved in the formation of a pseudothermal ghost image. When imaging a test pattern through turbulence, this method increases the imaged pattern visibility from V=0.150.04. By decoupling the entangled photon source from the ghost-imaging central image plane, we are able to dramatically increase the ghost-image quality. We use entangled photons and demonstrate that for a specific experimental configuration the effect of turbulence can be greatly diminished. We investigate the effect of turbulence on quantum ghost imaging.
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