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Fabricating Photonic Quantum Circuits in Silicon

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Silica waveguides form building blocks for qubit-based technologies.

Hank Hogan

The future of quantum technologies could be written in sand, according to researchers from the University of Bristol in the UK. A group at the institution demonstrated high-fidelity quantum photonic circuits using waveguides made of silicon dioxide, or silica — the main constituent of sand — on silicon. The investigators constructed a two-photon quantum interference and a controlled-NOT gate device, the latter achieving an average logical basis fidelity of greater than 94 percent. The design of an integrated quantum photonic circuit on a chip includes a direction coupler that replaces...Read full article

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    Published: July 2008
    Glossary
    silicon dioxide
    An abundant material found in the form of quartz and agate and as one of the major constituents of sand. The silicates of sodium, calcium, and other metals can be readily fused, and on cooling do not crystallize, but instead form the familiar transparent material glass.
    quantum interferenceQuantum TechnologiesResearch & TechnologySensors & Detectorssilicon dioxideTech Pulse

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