Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 47: Quantum Information (Quantum Communication and Quantum Repeater)
Q 47.5: Talk
Thursday, March 17, 2022, 11:30–11:45, Q-H12
Spectral multiplexing of individual Erbium dopants with stable transition frequency — •Alexander Ulanowski1, Benjamin Merkel1, and Andreas Reiserer1,2 — 1MPI of Quantum Optics, Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Ludwig-Maximilians-Universität München, München, Germany
In a future quantum internet, coherent emitters will exchange quantum states over global distances, preferably using optical fibers. Erbium dopants exhibit an optical transition at telecommunication wavelength that would enable a low-loss transmission over long distances. To achieve an efficient spin-photon interface for single dopants, we embed a thin crystalline membrane into a tunable Fabry-Perot resonator with a finesse of 9.0(7)·104 which leads up to a 70-fold Purcell enhancement. Our approach avoids the proximity of the emitters to interfaces and thus allows us to preserve the coherence up to the lifetime limit [1]. At the tail of the inhomogeneous broadening we spectrally resolve and control around 100 individual dopants with low spectral diffusion below 0.2 MHz [2]. Furthermore, at high magnetic fields some dopants reveal slow diffusion dynamics, allowing us to apply a feed-forward correction on the emission frequency and reducing the linewidth down to 0.1 MHz. Our findings enable frequency-multiplexed spin-qubit readout, control and entanglement, opening unique perspectives for the implementation of repeater nodes in a quantum network.
[1] B. Merkel et al., Phys.Rev.X 10, 041025 (2020).
[2] A. Ulanowski, B. Merkel, A. Reiserer, ArXiv:2110.09409 (2021).