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Q: Fachverband Quantenoptik und Photonik

Q 6: Solid State Quantum Optics I

Q 6.1: Vortrag

Montag, 11. März 2024, 11:00–11:15, HS 3118

Spin properties of erbium dopants in nanophotonic silicon waveguides — •Kilian Sandholzer, Stephan Rinner, Kilian Baumann, Adrian Holzäpfel, Andreas Gritsch, and Andreas Reiserer — Technical University of Munich, Munich Center for Quantum Science and Technology, and Max Planck Institute for Quantum Optics, Garching, Germany

The optical transitions of 4f-electrons in implanted erbium ions are in the telecommunication range making this solid-state system well suited for quantum networks. The incorporation in silicon allows us to use industrial nanofabrication to shape the optical properties of the erbium ions via photonic mode engineering. Our implantation and annealing recipe provide reproducible site integration with promising spin properties of the erbium 4f-electrons. The crystal field splits the lowest spin-degenerate electronic state by 2.6 THz and 2.4 THz in the ground and excited state manifold, respectively, creating two optically coupled isolated effective spin-1/2 systems. We measure the strength and orientation of the effective g-tensors by spectroscopy of a rotating sample in an external magnetic field. Furthermore, the lifetime of the ground-state electron spin is measured using spectral hole burning in dependence of temperature and magnetic field. We find a lower bound of 1 s for the spin lifetime at temperatures below 4.5 K and observe an Orbach-type suppression at higher temperatures. These spin properties are measured on commercially fabricated samples¹ promising easy scalability of this quantum spin-photon interface.

[1] S. Rinner et al., Nanophotonics 12, 3455, (2023)

Keywords: quantum networks; erbium; spin qubits; quantum information; quantum repeater