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Wednesday, March 9th 2011

3:35 pm:

Entangled photons have turned out to be a major resource in many quantum information protocols and procedures. In quantum cryptography, the entanglement-based systems promise to provide a significant security advantage because of the possibility of testing the security by a violation of Bellâ€™s theorem. In quantum computation, photons suffer one disadvantage, which is the fact that nonlinear interaction between different photons is not big enough so far. The alternative is to use the measurement processes in the fact of linearity, as pointed out by Knill, Laflamme and Milburn. Furthermore, it is possible by fast feed-forward to create a deterministic photonic quantum computer, also called a one-way quantum computer, as suggested by Raussendorf and Briegel. Such a device uses highly entangled cluster states. A number of basic procedures have already been demonstrated for such a scheme. Further development leads to possibilities of quantum simulation, for example of a frustrated Heisenberg spin chain. In the talk, I will review the present experimental situation and give some examples.

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