Ghost imaging (correlated imaging) has been extensively investigated in recent years, both theoretically and
experimentally. By using the second-order or high-order coherence properties of light field and the correlation
measurement, ghost imaging was realized with quantum entangled light, pseudo-thermal light and even true thermal light.
In this work, basing on the theory of statistical optics, we model the dynamic process of thermal variation, and obtain the
ghost interference and ghost imaging by means of simulated calculation. In the later experiment, a pseudo-thermal source
is firstly prepared by using a laser beam to pass through a rotating ground glass plate, and the parameters of the
pseudo-thermal source are obtained via Hanbury-Brown-Twiss (HBT) experiment. With the pseudo-thermal light, we
perform ghost interference. The experimental results demonstrate the accordance of numerical prediction. And our
conclusion shows that the quality of ghost interference is influenced by the size of the pinhole in the reference path, the
little pinhole due to a higher quality of ghost interference.
We construct a compact polarization-entangled photon source using type-II degenerate spontaneous parametric down-conversion (SPDC) in beta-barium borate (BBO) crystal pumped by a 405 nm violet laser diode. In order to compensate the spatial displacement and the temporal delay due to the birefringence and dispersion effect of signal and idler photons, we make the down-converted photon pairs pass through a half wave plate and an additional BBO crystal with the half thickness of the original one. This improves the visibility of two-photon interference by eliminating the distinguishability of the paired photons. We measure the polarization correlations by two adjustable polarization analyzers in two conjugate bases, H/V and +45°/-45°, respectively. The polarization analyzer consists of a polarization beam splitter cube preceded by a rotatable half wave plate. When rotating one of the half wave plates and keeping the other one at fixed angle, we obtain the expected sin2 dependence of the coincidence counts. The highly visible sinusoidal coincidence indicates the violation of the Bell inequality and demonstrates the high quality of the polarization-entangled photon source. This compact polarization-entangled photon source is easily configurable and robust to demonstrate optical quantum information processing.
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