Isotope separation by nonlinear resonances in a Paul trap

Alheit, R.; Enders, K.; Werth, G.

doi:10.1007/bf01081052

Cited by 20 publications

(15 citation statements)

References 9 publications

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“…These two species are laser-cooled for the first time in the experiments reported here. The limited isotope-selectivity attainable for these rare ions means that some form of "purification" of the ions loaded is necessary [13,14]; in the case of 43 Ca + we show that this is possible with no loss of the desired species. Hence it should be possible to load arbitrarily large crystals of this important ion.…”

Section: Introductionmentioning

confidence: 94%

Isotope-selective photoionization for calcium ion trapping

et al. 2004

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We present studies of resonance-enhanced photoionization for isotope-selective loading of Ca ϩ into a Paul trap. The 4s 2 1 S 0 ↔4s4p 1 P 1 transition of neutral calcium is driven by a 423 nm laser and the atoms are photoionized by a second laser at 389 nm. Isotope selectivity is achieved by using crossed atomic and laser beams to reduce the Doppler width significantly below the isotope shifts in the 423 nm transition. The loading rate of ions into the trap is studied under a range of experimental parameters for the abundant isotope 40 Ca ϩ . Using the fluorescence of the atomic beam at 423 nm as a measure of the Ca number density, we estimate a lower limit for the absolute photoionization cross section of 170͑60͒ Mb. We achieve loading and laser cooling of all the naturally occurring isotopes, without the need for enriched sources. Laser heating/cooling is observed to enhance the isotope selectivity. In the case of the rare species 43 Ca ϩ and 46 Ca ϩ , which have not previously been laser cooled, the loading is not fully isotope selective, but we show that pure crystals of 43 Ca ϩ may nevertheless be obtained. We find that for loading 40 Ca ϩ the 389 nm laser may be replaced by an incoherent source.

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Section: Introductionmentioning

confidence: 94%

Isotope-selective photoionization for calcium ion trapping

et al. 2004

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“…Harmonic axial potential: The harmonicity of the trap potential is of importance for a number of reasons: Particle trapping is more stable and non-linear resonances [29] are avoided such that a long storage time is guaranteed. Second, the qubit measurement relies on the detection of an inductive voltage pick-up at ω z from the electron motion which is of the order of a few nV and is therefore detected after a narrow-band filtering and amplification, see sect.…”

Section: Planar Penning Trapsmentioning

confidence: 99%

Experimental and theoretical challenges for the trapped electron quantum computer

Marzoli

Tombesi

Ciaramicoli

et al. 2009

J. Phys. B: At. Mol. Opt. Phys.

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1 2 Experimental and theoretical challenges for the trapped electron quantum computerWe discuss quantum information processing with trapped electrons. After recalling the operation principle of planar Penning traps we sketch the experimental conditions to load, cool and detect single electrons. Here we present a detailed investigation of a scalable scheme including feasibility studies and the analysis of all important elements, relevant for the experimental stage. On the theoretical side, we discuss different methods to couple electron qubits. We estimate the relevant qubit coherence times and draw implications for the experimental setting. A critical assessment of quantum information processing with trapped electrons is concluding the article.

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“…A still more accurate determination of the position of the non-linear resonances might allow a selective modification of the relative isotopic abundance in the ion cloud of the element under study, or a controlled decrease of the number of the stored ions [7].…”

Section: Discussionmentioning

confidence: 99%

“…We choose Pr + as a case study because it has only one stable isotope, relatively strong lines from the ground level and a low lying metastable level with good separations of the hyperfine structure (hfs) components. Knowledge of the non-linear resonance in a specific case could also be helpful to modify the number of ions and, in case of other rare earth ions, the isotope composition of the ion cloud [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the stability diagram for Paul traps in the case of praseodymium ions

et al. 2006

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The present paper describes an investigation of non-linear resonances of praseodymium ion clouds stored in a Paul trap as a function of the storage parameters. These have been observed in traps with different ring electrode diameters. In these different traps the resonances occur for different values of the operating parameters. Discrepancies with the approximation model for one ion have been found. The intensity of the fluorescence signal and the Doppler half width have been recorded as a function of one of the storage parameters: q. We use our results to optimize the fluorescence signal of the stored ions, which is especially useful in the case of the double-resonance method.

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Isotope separation by nonlinear resonances in a Paul trap

Cited by 20 publications

References 9 publications

Isotope-selective photoionization for calcium ion trapping

Isotope-selective photoionization for calcium ion trapping

Experimental and theoretical challenges for the trapped electron quantum computer

Experimental investigation of the stability diagram for Paul traps in the case of praseodymium ions

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