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Heralded single photon sources are the subject of intense research owing to their usefulness in metrology and quantum information. These are often created using a pair of photons produced by spontaneous parametric downconversion (SPDC), from which one photon is used to certify the presence of the other. However, multiple-pair production and detector dark counts limit the quality of such sources. Here,...
Incident angle of light source is a key factor that affects imaging resolution of direct optical imaging for a reflected target. For a large incident angle, it is easy to form the “blind area” in which the image of the object cannot be distinguished clearly. Using classical statistical optics, we study ghost imaging (GI) for a reflected object numerically and experimentally and show that by measuring...
We split a circular pseudo-thermal light beam and rotate one of them about its propagation axis. The intensity correlation measurement between the two light beams reveals the Berry Phase related to the rotation.
Spontaneous down conversion (SPDC) occurs in a nonlinear crystal when a pump photon splits in a pair of signal and idler photons. This paper demonstrates detection of single photons in low light level images with an electron multiplying CCD camera (EMCCD). The opposite spatial fluctuations of SPDC radiation are correlated in the quantum regime. Here, correlations between pixels are presented for collinear...
An experimental detection scheme is demonstrated for directly measuring the spectrum of a parametric down-conversion (PDC) source by the use of a highly dispersive fibre. A temporally narrow pulse envelope is spectrally stretched in time by chromatic group velocity dispersion. In order to maximise this effect the high group velocity dispersion of a commercially available dispersion compensating fibre...
A blazed grating is used for the separation of single photons from photon pairs. The Fraunhofer far field of the two-photon rate depends on the spatial correlation strength of the photons and enables correlation characterizations.
Using an entangled photon-pair traveling through two separate dispersive media, we experimentally demonstrate nonlocal dispersion cancellation in which the dispersion experienced by one photon cancels the dispersion experienced by the other photon.
We compare the quality of images formed by quantum and thermal ghost imaging systems. We find the resolution to be the same and determine the scaling laws for the contrast and signal-to-noise ratio.
We discuss the relationship between the joint intensity of parametric downconversion photon pairs and certain spectral (temporal) properties of the resulting heralded single photons, including purity and departure from the Fourier transform limit.
We demonstrate a technique of measuring Glauberpsilas normalized correlation functions for nonclassical light generated in the pulsed regime. In particular, intensity correlation functions are studied for the transition between spontaneous and stimulated parametric down-conversion.
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