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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Information (Quantum Communication and Quantum Repeater) II

Q 48.5: Vortrag

Donnerstag, 12. März 2020, 15:15–15:30, e001

A high bandwidth quantum network node with a single trapped ion in an ultraviolet fiber cavity — •Pascal Kobel¹, Moritz Breyer¹, Ralf Berner¹, Vidhya Sasidharan Nair¹, Konstantin Ott², Jakob Reichel², and Michael Köhl¹ — ¹Physikalisches Institut, Universität Bonn, Wegelerstraße 8, D-53115 Bonn, Germany — ²Laboratoire Kastler-Brossel, ENS/UPMC-Paris 6/CNRS, F-75005 Paris, France

We investigate the integration of fiber cavities into ion traps for use in quantum networks. Since ions typically have their strongest dipole transition in the ultraviolet (UV), the extension of fiber cavities to work in the UV is important for high bandwidth networks. We present coupling of a single Ytterbium ion to a 260 µm long fiber cavity, which is resonant with the electric dipole transition at 370 nm. We achieve a coherent coupling rate of a single ion to the cavity of about g/2π = 60 MHz, which exceeds previous realizations by more than one order of magnitude. Using the Purcell effect, we demonstrate single photon generation and efficient extraction by pulsed ion excitation. Coherent manipulation of the hyperfine qubit enables us to investigate entanglement between the photon polarization and the spin state of the ion.