10.6084/m9.figshare.1012252.v1 M R Kamsap M R Kamsap T B Ekogo T B Ekogo J Pedregosa-Gutierrez J Pedregosa-Gutierrez G Hagel G Hagel M Houssin M Houssin O Morizot O Morizot M Knoop M Knoop C Champenois C Champenois Time evolution of the population of the D<sub>3/2</sub> (red dotted line), S<sub>1/2</sub> (black dashed line) and D<sub>5/2</sub> (dot-dashed blue line) states during an incomplete STIRAP process driven by Gaussian pulses Ω<sub><em>B</em></sub>(<em>t</em>) and Ω<sub><em>R</em></sub>(<em>t</em>) kept constant since <em>t</em> = 40  μs (see equation (6)) IOP Publishing 2013 STIRAP process Raman adiabatic passage ion parameter mhz THz qubit structure components scheme state transfer transfer efficiency metastable states omega Doppler shift Atomic Physics Molecular Physics 2013-06-21 00:00:00 Figure https://iop.figshare.com/articles/figure/_Time_evolution_of_the_population_of_the_D_sub_3_2_sub_red_dotted_line_S_sub_1_2_sub_black_dashed_li/1012252 <p><strong>Figure 8.</strong> Time evolution of the population of the D<sub>3/2</sub> (red dotted line), S<sub>1/2</sub> (black dashed line) and D<sub>5/2</sub> (dot-dashed blue line) states during an incomplete STIRAP process driven by Gaussian pulses Ω<sub><em>B</em></sub>(<em>t</em>) and Ω<sub><em>R</em></sub>(<em>t</em>) kept constant since <em>t</em> = 40  μs (see equation (<a href="http://iopscience.iop.org/0953-4075/46/14/145502/article#jpb467794eqn06" target="_blank">6</a>)). Laser parameters are τ = Δ<em>t</em> = 28  μs, Ω<sub><em>C</em></sub>/2π = 50 MHz, Δ<sub><em>C</em></sub>/2π = 10 MHz, \Omega _B^0/2\pi =400 MHz, Δ<sub><em>B</em></sub>/2π = 100 MHz, \Omega _R^0/2\pi =40 MHz, \Delta _R=\Delta _B-\Delta _C(1+\sqrt{1+4\alpha _C^2})/2.</p> <p><strong>Abstract</strong></p> <p>A stimulated Raman adiabatic passage (STIRAP)-like scheme is proposed to exploit a three-photon resonance taking place in alkaline-earth-metal ions. This scheme is designed for state transfer between the two fine structure components of the metastable D-state which are two excited states that can serve as optical or THz qubit. The advantage of a coherent three-photon process compared to a two-photon STIRAP lies in the possibility of exact cancellation of the first-order Doppler shift which opens the way for an application to a sample composed of many ions. The transfer efficiency and its dependence with experimental parameters are analysed by numerical simulations. This efficiency is shown to reach a fidelity as high as (1–8 <b>×</b> 10<sup>−5</sup>) with realistic parameters. The scheme is also extended to the synthesis of a linear combination of three stable or metastable states.</p>