Experimental one-way quantum computation using linear optics

POSTER

Abstract

Standard quantum computation is based on a universal set of unitary quantum logic gates which process qubits. In contrast to the standard quantum model, Raussendorf and Briegel proposed the one-way quantum computer, based on a highly-entangled cluster state, which is entirely different. We have experimentally realized four-qubit cluster states encoded into the polarization state of four photons. We fully characterize the quantum state by implementing the first experimental four-qubit quantum state tomography. Using this cluster state we demonstrate the feasibility of one-way quantum computing through a universal set of one- and two-qubit operations. Finally, our implementation of Grover's search algorithm demonstrates that one-way quantum computation is ideally suited for such tasks.

Authors

  • Philip Walther

    • Institute of Experimental Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria

  • Kevin Resch

    • University of Queensland, Physics Department, AUS

  • Terry Rudolph

    • QOLS, Blackett Laboratory, Imperial College London, London SW7 2BW, UK
    • Imperial College London

  • Emmanuel Schenck

    • Institute of Experimental Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria

  • Harald Weinfurter

    • Department of Physics, Ludwig Maximilians University, D-80799 Munich, Germany

  • Vlatko Vedral

    • The School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK

  • Markus Aspelmeyer

  • Anton Zeilinger

    • Institute of Experimental Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria