Precision Measurement of the<sup>2</sup>

Bell, A. S.; Gill, P.; Klein, Hugh; Levick, A. P.; Rowley, W. R. C.

doi:10.1080/09500349214550371

Cited by 29 publications

(6 citation statements)

References 12 publications

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“…As a more dramatic illustration of the theoretical possibilities of the Cirac-Zoller scheme, one may consider a computer based on the 4f 14 6s 2 S 1/2 ↔ 4f 13 6s 2 2 F 1/2 electric octupole transition of Yb II. This very long lived transition, which has received considerable attention because of its potential applications as an optical frequency standard, has a wavelength of 467 nm and a calculated lifetime of 1533 days [12]. Performing a similar calculation to that given above suggests that, using this ion, it might be possible to factor a 438-bit number.…”

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confidence: 84%

Decoherence Bounds on Quantum Computation with Trapped Ions

et al. 1996

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Using simple physical arguments we investigate the capabilities of a quantum computer based on cold trapped ions. From the limitations imposed on such a device by spontaneous decay, laser phase coherence, ion heating and other sources of error, we derive a bound between the number of laser interactions and the number of ions that may be used. The largest number which may be factored using a variety of species of ion is determined.Comment: 5 pages in RevTex, 2 figures, the paper is also avalaible at http://qso.lanl.gov/qc

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confidence: 84%

Decoherence Bounds on Quantum Computation with Trapped Ions

et al. 1996

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“…The long storage times and low temperatures (41 K) readily attainable in ion traps greatly reduce transit-time and Doppler broadening and allow the possibility of observing extremely narrow resonances. One of the favoured candidates for these investigations is the Yb + ion, which has a number of ultra-narrow optical transitions involving the long-lived 2D° and 2F° metastable levels [2,3,4], as well as a favourabte microwave transition between 171yb hyperfine states in the 62S1/2 ground level [5,6,7]. The most suitable resonance lines for laser cooling Yb + ions are the 6s2S1/2-6p2p°/2 and 6s2S~/2 -6p 2P°/2 transitions at 369.52 nm and 328.94 nm, and accurate knowledge of the natural widths of these transitions is often required for estimating the temperature of the Yb + ions and for modelling the dynamics of the laser-cooling processes.…”

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confidence: 99%

Radiative lifetimes of the 6p 2 P 2/01 and 6p 2 P 2/03 levels in Yb II

Löwe

Hannaford

Pendrill

1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract. Radiative lifetimes have been determined for the 62P°/2 and 62P°/2 levels in Yb II using the method of laser-induced fluorescence from sputtered metal vapour. The results, 8.0(2)ns (62p°/2) and 6.3(3)ns t62p ° Narrow transitions in laser-cooled ions stored in radiofrequency traps are currently being investigated in a number of laboratories as future frequency standards in the optical and microwave regimes (see e.g. [1]). The long storage times and low temperatures (41 K) readily attainable in ion traps greatly reduce transit-time and Doppler broadening and allow the possibility of observing extremely narrow resonances. One of the favoured candidates for these investigations is the Yb + ion, which has a number of ultra-narrow optical transitions involving the long-lived 2D° and 2F° metastable levels [2,3,4], as well as a favourabte microwave transition between 171yb hyperfine states in the 62S1/2 ground level [5,6,7]. The most suitable resonance lines for laser cooling Yb + ions are the 6s2S1/2-6p2p°/2 and 6s2S~/2 -6p 2P°/2 transitions at 369.52 nm and 328.94 nm, and accurate knowledge of the natural widths of these transitions is often required for estimating the temperature of the Yb + ions and for modelling the dynamics of the laser-cooling processes. Reported values for the radiative lifetimes of the 62P°~/2 and 62P°/2 levels in Yb II show considerable variation from one determination to another (see Table 2) and there do not appear to be any recent lifetime measurements based on accurate selective laser excitation techniques. Accurate lifetime measurements in Yb II are also required for comparison with the results of recent theoretical calculations using different approaches. In this paper we report radiative lifetime measurements for the 6 2p°/2 and 6 2p°3/2 levels in Yb II using selective laser excitation and compare the results with theoretical lifetimes calculated using ab initio many-body perturbation theory (MBPT).The lifetime measurements in Yb II have been performed using the technique of laser-induced fluorescence from sputtered metal vapour, which has been described in detail previously [8,9]. With this method, ytterbium ions are produced by cathodic sputtering in a low pressure neon discharge and selectively excited to the required upper level by short optical pulses from a nitrogen-laserpumped dye laser. Time-resolved fluorescence from the excited levels is detected by a photomultiplier and recorded in a transient digitiser. The 328.94 nm radiation required for excitation of the 6 2p°3/2 level was produced by second harmonic generation in an externally mounted BBO crystal. The discharge cell contained two cathodes, one of metallic ytterbium, and the second of copper which permitted lifetime checks to made against the accurately known lifetime of the Cu I 4p 2P°/2 level [10]. The procedure was to alternately measure the Cu I and Yb II lifetimes during each series of measurements. In all cases the measured Cu I lifetimes were within 2% of the previously reported value of 7.17 ___ 0.06 ns [...

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“…The tabulated uncertainty of the 467 nm transition frequency is 62.6 GHz ͑62s͒ [10]. This has been reduced to 68 MHz ͑62s͒ by measurements, made at the National Physical Laboratory (NPL), of the 2 S 1͞2 -2 D 5͞2 transition [4,11] and the 2 D 5͞2 -2 F 7͞2 transition [12] (see Table I). The Doppler width of the 467 nm transition was eliminated by confining the ion in a region of space much less than the wavelength of the incident light (the Lamb-Dicke regime [13]), by laser cooling the ion in a small electrodynamic trap.…”

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Observation of an Electric Octupole Transition in a Single Ion

et al. 1997

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The 2 S 1͞2-2 F 7͞2 electric octupole ͑E3͒ transition in 172 Yb 1 has been detected by observing quantum jumps in a single laser cooled ion, stored in an electrodynamic trap. The transition frequency is 642 116 785.3(0.7) MHz ͑1s͒. Consideration of the transition rate and laser parameters implies a 2 F 7͞2 level lifetime of 3700 days. This is the first time an atomic E3 transition has been driven. This transition has applications as an optical frequency reference. [S0031-9007(96)02175-8]

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Precision Measurement of the²

Cited by 29 publications

References 12 publications

Decoherence Bounds on Quantum Computation with Trapped Ions

Decoherence Bounds on Quantum Computation with Trapped Ions

Radiative lifetimes of the 6p 2 P 2/01 and 6p 2 P 2/03 levels in Yb II

Observation of an Electric Octupole Transition in a Single Ion

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Precision Measurement of the2

Cited by 29 publications

References 12 publications

Decoherence Bounds on Quantum Computation with Trapped Ions

Decoherence Bounds on Quantum Computation with Trapped Ions

Radiative lifetimes of the 6p 2 P 2/01 and 6p 2 P 2/03 levels in Yb II

Observation of an Electric Octupole Transition in a Single Ion

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About

Precision Measurement of the²