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Collinear source of polarization-entangled photon pairs at nondegenerate wavelengths
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View: Figures


Image of FIG. 1.
FIG. 1.

Calculated dependence of the relative phase on the wavelengths of pump and one of the down-conversion photons for (a) uncompensated and (b) compensated configuration. The evaluation assumes SPDC in the pair of BBO crystals, each thick and cut at ; an overall phase offset is suppressed for clarity. After the optimum compensation using two crystals with thicknesses of 8.20 and , the phase map becomes flat (note the change in the vertical scale), indicating a high purity of the entangled state.

Image of FIG. 2.
FIG. 2.

Scheme of the collinear source. A free-running violet laser diode pumps a pair of BBO crystals and collinearly produces via SPDC nondegenerate photons, which are collected into a single mode fiber. The photons are separated into two spatial modes using a wavelength division multiplexer. Two compensation crystals and BBO crystals are used to reverse the time delay effect and spatial lateral displacement effect, respectively, introduced in the down-conversion BBO crystals.

Image of FIG. 3.
FIG. 3.

Detected single and coincidence count rates depending on the pump power measured at the position of BBO crystals.

Image of FIG. 4.
FIG. 4.

Spectral distribution of down-conversion light with the central wavelengths of and , determined from a Gaussian fit (solid line). The lower peak number of counts at is due to a reduced efficiency of the spectrometer (with resolution ) towards infrared wavelengths. The dashed line shows the numerically simulated spectra obtained under the assumption of narrowband pumping.


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Scitation: Collinear source of polarization-entangled photon pairs at nondegenerate wavelengths