Quantum Cryptography using a single photon source based on entangled photon pairs
Andreas Poppe (Universität Wien, Austria)
Wednesday, 31 Mar 2004, 14.00, W0.03
After a short motivation that points out the advantages from quantum cryptography in comparison to classical methods, I will give a short overview of state-of-the-art single photon sources and methods that can be used. Moreover, the most fascinating concept of entanglement is the basis of our work. Recent development of blue and violet laser diodes removed the need of bulky Ar-Ion lasers as a pump source for the nonlinear process generates pairs of entangled photons. At the moment some groups in Europe work towards compact sources that can be used in experiments outside of laboratories to demonstrate field abilities. I also report on our last experiment where we could violate Bell's inequality with photons distributed over the river Danube. With some plans to the near future and visions that may be realized in the far future I will try to give you a good impression of that oncoming field that probably will be the first large implication of quantum mechanics.
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