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Optica Publishing Group
  • International Quantum Electronics Conference
  • 1996 OSA Technical Digest Series (Optica Publishing Group, 1996),
  • paper WB6

Stimulated emission and stochastic cooling of a single ion

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Abstract

Selective spectroscopic detection of an individual ion and control of its centre-of-mass motion are prerequisite for the ion’s application as a frequency standard [1] or a quantum computer [2], A singly dynamically trapped Ba*-ion has been irradiated by monochromatic 493-nm and 650-nm laser light close to resonance with the S1/2 - P1/2 resonance line and the D3/2 - P1/2 line, respectively. Its fluorescence was detected, and it was 3D-cooled down into the Lamb-Dicke regime far below the Doppler limit and [3] with the help of electronic Raman excitation [4], When irradiation by tunable 1.76 µ.m-light on resonance of the E2 line S/2 - D5/2 (Fig. 1 ) alternates with the visible light, successfully exciting the ion is signaled by missing resonance scattering in the next half cycle (“off”). Recording the "on-off" rate vs tuning the IR light shows an absorption spectrum of the ion’s E2 line including sidebands from residual motion in the trapping potential (Fig. 2a). Since lower and upper sideband scale like <n> and <n+l>, respectively, the mean vibrational quantum number <n> is derived.

© 1996 Optical Society of America

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