Single Indium Ion optical frequency Standard

Eichenseer, M.; Nevsky, A.; Okhapkin, M.; Schwedes, Christian; Zanthier, J. von; Walther, H.

doi:10.1109/cpem.2004.305592

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“…The present work is motivated by strong progress in storing, cooling and coherently manipulating single ions in Paul traps. Together with the ultra-precise optical frequency measurements achieved by frequency chains and frequency combs, these progress lead to the realization of single-ion frequency standards, as for Hg + [2], Sr + [3,4], Yb + [4] and In + [5], and proposed for Ca + [6]. Our experimental project aims to build an optical frequency standard using the electric quadrupole transition 4S 1/2 → 3D 5/2 of a single calcium ion at 729 nm.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the ultimate performances of a Ca+ single-ion frequency standard

et al. 2004

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We numerically evaluate the expected performances of an optical frequency standard at 729 nm based on a single calcium ion. The frequency stability is studied through the Allan deviation and its dependence on the excitation method (single Rabi pulse or two Ramsey pulses schemes) and the laser linewidth are discussed. The minimum Allan deviation that can be expected is estimated to σ y (τ ) ≈ 2.5 × 10 −15 / √ τ with τ the integration time. The frequency shifts induced by the environmental conditions are evaluated to minimize the uncertainty of the proposed standard by chosing the most suited environment for the ion. If using the odd isotope 43 Ca + and a vessel cooled to 77 K, the expected relative shift is −2 × 10 −16 with an uncertainty of ±4 × 10 −16 , mainly due to the quadrupole shift induced by the unknown static electric field gradient .

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