A single ion coupled to an ultraviolet fiber cavity

We investigate the integration of fiber cavities into ion traps for use in quantum networks. Up to now, fiber cavities have been combined with trapped ions only in the infra-red spectral range. Since ions typically have their... [ view full abstract ]

We investigate the integration of fiber cavities into ion traps for use in quantum networks. Up to now, fiber cavities have been combined with trapped ions only in the infra-red spectral range. 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 150 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/2p = 60 MHz, which exceeds previous realizations by more than one order of magnitude. Using the Purcell effect, we demonstrate single photon generation by continuous and pulsed ion excitation. Coherent manipulation of the hyperfine qubit, using microwaves and optical Raman pulses, enables us to investigate entanglement between the photon polarization and the spin state of the ion.