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Conference on Lasers and Electro-Optics

Spontaneous emission lifetime of a single Ca+ ion in a high finesse optical cavity

Christoph Becher, Axel Kreuter, Gavin P. T. Lancaster, A.B. Mundt, Carlos Russo, Hartmut Häffner, Christian Roos, Jürgen Eschner, Ferdinand Schmidt‐Kaler, R. Blatt

Published Jan 1, 2004• 0 citations
Publisher

Abstract

We measure the spontaneous emission lifetime of the D5/2 level of a single Ca+-ion by Pi-pulse excitation and quantum state detection. As the trapped ion is well localized we map the standing-wave cavity vacuum field.
DOI
10.1364/iqec.2004.ituc2

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arXiv:quant-ph/0202112•Physical Review Letters•Aug 13, 2002•304 citations
We investigate the spontaneous emission lifetime of a single trapped (40)Ca+ ion placed at different positions in the vacuum standing wave inside a high finesse cavity which is stabilized to the atomic transition. The lifetime is measured by quantum state detection after pi-pulse excitation. The result for the natural lifetime of the D(5/2) metastable state of 1161(22) ms agrees, within 1 standard deviation, with the most precise published value. We observe a reduction of the spontaneous emission lifetime of approximately 15% in the node of the vacuum field.
The quadrupole S(1/2)-D(5/2) optical transition of a single trapped Ca+ ion, well suited for encoding a quantum bit of information, is coherently coupled to the standing wave field of a high finesse cavity. The coupling is verified by observing the ion's response to both spatial and temporal variations of the intracavity field. We also achieve deterministic coupling of the cavity mode to the ion's vibrational state by selectively exciting vibrational state-changing transitions and by controlling the position of the ion in the standing wave field with nanometer precision.