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Narrow Optical Line Widths in Erbium Implanted in TiO2.

Christopher M Phenicie, Paul Stevenson, Sacha Welinski

    Nano Letters
    |November 26, 2019
    PubMed
    Summary

    Researchers explored rare earth ions for quantum technologies. By ion-implanting Erbium (Er3+) into titanium dioxide (TiO2), they achieved efficient incorporation and narrow spectral lines, paving the way for longer spin coherence times.

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    Area of Science:

    • Solid-state and quantum defect research.
    • Quantum information science and technology.

    Background:

    • Atomic and atomlike defects are crucial for quantum computing, networks, and sensors.
    • Rare earth ions offer narrow optical and spin transitions, but nuclear spin noise in common hosts limits coherence times.
    • Exploring new host materials with low nuclear spin abundance is essential for advancing quantum technologies.

    Purpose of the Study:

    • To investigate the potential of titanium dioxide (TiO2) as a host for rare earth ions, specifically Erbium (Er3+).
    • To assess the viability of ion implantation as a method for incorporating Er3+ into TiO2.
    • To evaluate the spin and optical properties of Er3+ in TiO2 for quantum applications.

    Main Methods:

    • Ion implantation of Er3+ into TiO2 crystals.
    Keywords:
    Rare earth ionselectron spin resonanceerbiumion implantationoptical spectroscopyquantum optics

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  • Characterization of Er3+ incorporation sites and yield using material analysis techniques.
  • Measurement of spin and optical linewidths using spectroscopic methods.

    • Main Results:

    • Efficient incorporation of Er3+ into the Ti4+ site in TiO2 with over 50% yield.
    • Observation of narrow inhomogeneous spin (20 MHz) and optical (460 MHz) linewidths for Er3+ in TiO2.
    • Achieved linewidths are comparable to those in established crystalline hosts.

    Conclusions:

    • Ion implantation is a viable technique for introducing rare earth ions into novel host materials like TiO2.
    • TiO2 is a promising host material for rare earth ions due to its low natural abundance of nuclear spins.
    • This work represents a significant step towards developing individually addressed rare earth ions with extended spin coherence times for quantum technologies.