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(a) Time evolution of the population of the D3/2 (red dotted line), P1/2 (× 104, green solid line), S1/2 (× 102, black dashed line) and D5/2 (dot-dashed blue line) states during the STIRAP process driven by the Gaussian pulses ΩB(t) and ΩR(t) (see equation (6))

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posted on 2013-06-21, 00:00 authored by M R Kamsap, T B Ekogo, J Pedregosa-Gutierrez, G Hagel, M Houssin, O Morizot, M Knoop, C Champenois

Figure 3. (a) Time evolution of the population of the D3/2 (red dotted line), P1/2 (× 104, green solid line), S1/2 (× 102, black dashed line) and D5/2 (dot-dashed blue line) states during the STIRAP process driven by the Gaussian pulses ΩB(t) and ΩR(t) (see equation (6)). Laser parameters are τ = Δt = 20  μs, ΩC/2π = 10 MHz, ΔC/2π = 100 MHz, \Omega _B^0/2\pi =400 MHz, ΔB/2π = 100 MHz, \Omega _R^0/2\pi =40 MHz, ΔR = ΔB − ΔC − αCΩC/2. (b) Time evolution of the Rabi frequency ΩB(t) (blue dashed line) and ΩR(t) (red solid line); ΩC is constant during the STIRAP process.

Abstract

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 × 10−5) with realistic parameters. The scheme is also extended to the synthesis of a linear combination of three stable or metastable states.

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