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    silicon carbide tagged posts

    A Chip-Scale Broadband Light Source in Silicon Carbide

    March 21, 2022, Categories  Physics, Technology/Electronics

    (a) Schematic top view (left) and cross section (right) of the 4H-silicon-carbide-on-insulator platform for frequency comb generation based on compact microring resonators. The sidewall angle (θ) is estimated near 80–85 deg in our nanofabrication. Dispersion engineering is carried out by varying the ring waveguide width (RW). In addition, efficient coupling is realized using the pulley structure where the access waveguide width and coupling length are adjusted to achieve phase matching to the desired resonant mode families. (b) Scanning electron micrograph of a 36-μm-radius SiC microring. In this work, the SiC thickness is fixed at 500 nm with a pedestal layer of 50 nm. (c) Simulated integrated dispersion [Dint; see its definition in Eq. (1)] for the fundamental transverse-electric (i.e...
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    Simple Mod makes Quantum States Last 10,000 times longer

    August 15, 2020, Categories  Physics

    Quantum coherance
    From left: Scientists Kevin Miao, Chris Anderson and Alexandre Bourassa work on quantum research in the Awschalom lab at the University of Chicago’s Pritzker School of Molecular Engineering.
    Photo by David Awschalom

    Simple innovation expected to open multiple new avenues for quantum science. If we can harness it, quantum technology promises fantastic new possibilities. But first, scientists need to coax quantum systems to stay yoked for longer than a few millionths of a second.

    A team of scientists at the University of Chicago’s Pritzker School of Molecular Engineering announced the discovery of a simple modification that allows quantum systems to stay operational – or “coherent” – 10,000 times longer than before...

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