Dr. Michael Trupke
Institute for Quantum Optics and Quantum Information (IQOQI) - Vienna

M. Trupke received his PhD degree at Imperial College London, where he worked on light-matter interactions with ultracold atoms. He is currently Senior Research Associate at the Institute for Quantum Optics and Quantum Information (IQOQI-Vienna) of the Austrian Academy of Sciences. His research team works on quantum technology for sensing, communication, and computation with defects in crystals, as well as using levitated superconductors. He has led several conferences and university courses on quantum science and technology, and has been awarded numerous national and European grants for quantum technology research, both as principal investigator and as coordinator.


Abstract:
Quantum sensing and quantum photonics with spin centres in crystals

Spin centres in crystals, particularly in diamond and silicon carbide (SiC), have emerged as a key platform for the development of quantum technology. Following a brief overview, two systems will be discussed which are being researched at IQOQI-Vienna. The nitrogen-vacancy (NV) centre in diamond has spearheaded the development of spin centres for quantum technology, chiefly towards quantum sensing. Their sensitivity is in part limited by the spin contrast and by the collection of photoluminescence. I will present a method to improve the spin contrast by tailoring the optical initialization to the NV’s ionization cycle [1]. I will also describe progress on electrical readout, which allows to circumvent optical collection, with a view to enhanced state readout [2]. For quantum photonics, other systems are being explored in search of better optical properties. In many cases, their performance is significantly reduced by wavelength conversion from the telecom range to the optical transition frequency of the atoms or defects. Vanadium in SiC has emerged as a strong candidate for these applications [3,4]: It has a strong optical transition at 1.3 µm, compatible with optical fiber networks, a long-lived electron spin, and is hosted in a material that is available with high quality at an industrial scale. Our investigations have resulted in significant advances in our understanding of this remarkable system, the control of its electron spin, and the development of photonic interfaces for quantum networks.

[1] D. WIRTITSCH et al., Phys. Rev. Research 5 1, 013014 (2023); https://doi.org/10.1103/PhysRevResearch.5.013014.
[2] M. GULKA et al., Nat Commun 12 1, 4421 (2021); https://doi.org/10.1038/s41467-021-24494-x.
[3] T. ASTNER et al., Quantum Science and Technology 9, 3, 035038 (2024); https://iopscience.iop.org/article/10.1088/2058-9565/ad48b1/metaP. CILIBRIZZI et al., Nature Communications 14 1, 8448 (2023); https://doi.org/10.1038/s41467-023-43923-7.


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