Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 66: Quantum Information: Photons and Nonclassical Light III
Q 66.2: Talk
Friday, March 12, 2010, 14:15–14:30, E 214
Recent Results and Future Challenges of Photonic Quantum Computation — •Stefanie Barz1,2, Gunther Cronenberg1,2, Anton Zeilinger1,2, and Philip Walther1,2 — 1Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria — 2Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
Entangled photons are a crucial resource for quantum communication and linear optical quantum computation. Therefore the controlled generation of these fundamental states attracts a worldwide effort. The majority of current experiments is based on the production of photon pairs in the process of spontaneous parametric down-conversion, where the entangled photon pair is concluded from post-selection of randomly occurring coincidences. Here we present the heralded generation of photon states that are maximally entangled in polarization with linear optics and standard photon detection from spontaneous parametric down-conversion. We utilize the down-conversion state corresponding to the generation of three pairs of photons, where the coincident detection of four auxiliary photons unambiguously heralds the successful preparation of the entangled state. This controlled generation of entangled photon states is a significant step towards the applicability of a linear optics quantum network, in particular for entanglement distribution, entanglement swapping, quantum teleportation, quantum cryptography and scalable approaches towards photonics-based quantum computing schemes.