Düsseldorf 2007 – scientific programme
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SYDP: Symposium Dissertationspreis
SYDP 1: Dissertationspreis Symposium
SYDP 1.3: Invited Talk
Tuesday, March 20, 2007, 11:30–12:00, 5D
From Entangled Photons to Quantum Computation — •Philip Walther1,2, Mikhail Lukin2, and Anton Zeilinger1,3 — 1Institute for Experimental Physics, University of Vienna, A-1090 Vienna, Austria — 2Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA — 3Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences, A-1090 Vienna, Austria
Photons are robust and efficient carriers of quantum information, while atoms are well-suited for storage of quantum states. The first part of the present talk contains a review of several experimental demonstrations using linear optics and spontaneous parametric down-conversion. Depending on which sort of entangled photon-state was created, different experiments concerning quantum metrology and quantum computing, including the recent progress towards error-corrected linear optics quantum computing by the implementation of active feed-forward in a one-way quantum computer, could be demonstrated.
However, for the realization of a quantum network or efficient generation of multi-photon states quantum repeaters, which utilize quantum memory to store and release single-photons, are required. Recent experiments demonstrating the generation of narrow-bandwidth single photons using a room-temperature ensemble of 87Rb atoms and electromagnetically induced transparency should emphasize the progress towards a quantum network.