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Q: Quantenoptik

Q 9: Poster: Quantum Information

Q 9.16: Poster

Tuesday, April 3, 2001, 12:30–15:00, AT2

Highly stable wavelength reference for a near-infrared tunable monochromatic laser — •Ph. Leick, A. Keil, K. Abich, W. Neuhauser, Ch. Wunderlich, and P. E. Toschek — Institut für Laser-Physik, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg

Electronic and motional states of trapped Ba⁺ ions can be used to store and manipulate quantum information [1]. The E2 resonance, 6S_1/2 - 5D_5/2, (effective lifetime of the metastable state ≈ 40 s) of a single laser cooled ¹³⁸Ba⁺-ion in a Paul trap is driven using a color centre laser (λ=1762 nm) or, alternatively, an optical parametric oscillator. Implementation of quantum logic gates requires long-term frequency stability of these laser sources. This is achieved by locking the laser to a transmission mode of a cavity made of glass ceramics, suspended on springs in an ultra-high vacuum environment. Frictional damping of the cavity vibration permits to keep the setup compact. Measurements of absorption and emission spectra on the E2-transition characterize the residual instability of the cavity.

[1] B. Appasamy, Y. Stalgies, P. E. Toschek, Phys. Rev. Lett. 80, 2805 (1998).