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Q: Fachverband Quantenoptik und Photonik

Q 8: Präzisionsmessungen und Metrologie II

Q 8.2: Talk

Monday, March 10, 2008, 16:45–17:00, 3D

Absolute frequency measurement of the 4s ²S_1/2 ↔ 3d ²D_5/2 clock transition of a single ⁴⁰Ca⁺ in a Paul trap — •Michael Chwalla¹, Kihwan Kim¹, Gerhard Kirchmair², Mark Riebe¹, Thomas Monz¹, Mark Riebe¹, Philipp Schindler¹, Alessandro Villar², Christian F. Roos², Wolfgang Hänsel¹, Rainer Blatt^1,2, Michel Abgrall³, Daniele Rovera³, and Philippe Laurent³ — ¹Institut für Experimentalphysik, Universität Innsbruck, Techikerstr. 25, A-6020 Innsbruck — ²Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto Hittmair-Platz 1, A-6020 Innsbruck — ³SYRTE, Observatoire de Paris, 61 Av. de l’Observatoire, 75014 Paris, France

We present an absolute frequency measurement of a single, trapped ⁴⁰Ca⁺ ion at the 10⁻¹⁵ level, where a Cs referenced frequency comb is used to measure the frequency of the 4s ²S_1/2 ↔ 3d ²D_5/2 quadrupole transition at 411 042 129 776 396.2 ± 1.2 Hz. This is the most accurate measurement of Ca⁺ at present. A careful analysis of the estimated systematic shifts is given as well as an outlook on future improvements, which are required to possibly exceed the current precision of Cs-based frequency standards.