Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Quantum Communication III
Q 21.4: Talk
Tuesday, March 12, 2024, 11:45–12:00, HS 3219
Controlling individual erbium dopants in silicon — •Johannes Früh1,2, Andreas Gritsch1,2, Alexander Ulanowski1,2, Fabian Salamon1,2, Adrian Holzäpfel1,2, and Andreas Reiserer1,2 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2TU München and Munich Center for Quantum Science and Technology, 85748 Garching, Germany
Erbium dopants are promising candidates for the implementation of large-scale quantum networks since they can combine second-long ground state coherence (1) with coherent optical transitions at telecommunication wavelengths. So far, the long lifetime of the excited state made it difficult to spectrally resolve and control individual ions in order to harness them for quantum networks. To overcome this challenge, we embed erbium dopants into silicon photonic crystal resonators (2) and Fabry-Perot resonators (3) with small mode volume, which facilitates the direct comparison of the two approaches. While the nanophotonic resonators give Purcell enhancements up to 170, the Fabry Perot geometry avoids the proximity of interfaces and thus offers better optical coherence and narrower spectral diffusion linewidths down to 3 MHz. Reducting the latter down to lifetime limit, this approach is thus promising towards the entanglement of remote dopants.
(1) M. Rancic, M. P. Hedges, R. L. Ahlefeldt, M. J. Sellars, Nat. Phys. 14, 50 (2018)
(2) A. Gritsch, A. Ulanowski, A. Reiserer, Optica 10, 783-789 (2023)
(3) A. Ulanowski, B. Merkel, A. Reiserer, Sci. Adv, 8 (2022)
Keywords: Rare-Earth; Optical Resonator; Quantum Networks