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  • A quantum Fredkin gate

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    Author(s)
    Patel, Raj B
    Ho, Joseph
    Ferreyrol, Franck
    Ralph, Timothy C
    Pryde, Geoff J
    Griffith University Author(s)
    Pryde, Geoff
    Ho, Joseph
    Ferreyrol, Franck M.
    Patel, Raj B.
    Year published
    2016
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    Abstract
    Minimizing the resources required to build logic gates into useful processing circuits is key to realizing quantum computers. Although the salient features of a quantum computer have been shown in proof-of-principle experiments, difficulties in scaling quantum systems have made more complex operations intractable. This is exemplified in the classical Fredkin (controlled-SWAP) gate for which, despite theoretical proposals, no quantum analog has been realized. By adding control to the SWAP unitary, we use photonic qubit logic to demonstrate the first quantum Fredkin gate, which promises many applications in quantum information ...
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    Minimizing the resources required to build logic gates into useful processing circuits is key to realizing quantum computers. Although the salient features of a quantum computer have been shown in proof-of-principle experiments, difficulties in scaling quantum systems have made more complex operations intractable. This is exemplified in the classical Fredkin (controlled-SWAP) gate for which, despite theoretical proposals, no quantum analog has been realized. By adding control to the SWAP unitary, we use photonic qubit logic to demonstrate the first quantum Fredkin gate, which promises many applications in quantum information and measurement. We implement example algorithms and generate the highest-fidelity three-photon Greenberger-Horne-Zeilinger states to date. The technique we use allows one to add a control operation to a black-box unitary, something that is impossible in the standard circuit model. Our experiment represents the first use of this technique to control a twoqubit operation and paves the way for larger controlled circuits to be realized efficiently.
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    Journal Title
    Science Advances
    DOI
    https://doi.org/10.1126/sciadv.1501531
    Copyright Statement
    © The Author(s) 2016. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
    Subject
    Quantum Information, Computation and Communication
    Quantum Optics
    Publication URI
    http://hdl.handle.net/10072/99559
    Collection
    • Journal articles

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