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Effect of Gaussian Aperture Width on Visibility for Different Crystal Length | ||
| Journal of Al-Nahrain University - Science | ||
| Article 1, Volume 14, Issue 2, 2011, Pages 109-115 | ||
| Authors | ||
| Muslm Fadhel J; Adawiya J. Haider | ||
| Abstract | ||
| The main goal in Quantum Cryptography is high security and this can be achieved by usingsingle photon sources. The present work is a theoretical analysis devoted to investigate theinterference pattern of biphoton amplitude generated by spontaneous parametric down conversion(SPDC) in a nonlinear crystal (BBO) pumped by femtosecond optical pulses. We have studied thevisibility as a function of Gaussion aperture width for different parameters, such as the crystallength. The best visibility can be obtained at crystal length of (1.5 mm) . In our results, patternsoccur and increase with increase of crystal length and decreasing aperture diameter. When using slitaperture (vertical and horizontal direction), the coincident count is more symmetry in horizontalwith dimension (1×7) mm. With double crystal and parallel direction,the visibility decreasesdramatically with increase in the Gaussian aperture width, while at a distance between crystalsequal to (3mm) the visibility vanishes slowly at crystal thickness (L=0.5mm). | ||
| Keywords | ||
| entangled source; Quantum Cryptography; fs laser; quantum optics; quantum information | ||
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