Driving alkali Rydberg transitions with a phase-modulated optical lattice

• URL: http://arxiv.org/abs/2210.01874v1
• Date: Tue, 4 Oct 2022 19:46:55 GMT
• Title: Driving alkali Rydberg transitions with a phase-modulated optical lattice
• Authors: Ryan Cardman, Georg Raithel
• Abstract summary: We develop and demonstrate a spectroscopic method for Rydberg-Rydberg transitions using a standing-wave laser field. The method is based on the ponderomotive interaction of the Rydberg electron, which has less-restrictive selection rules than electric-dipole couplings. The method paves the way for optical Doppler-free high-precision spectroscopy of Rydberg-Rydberg transitions and for spatially-selective qubit manipulation.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We develop and demonstrate a spectroscopic method for Rydberg-Rydberg transitions using a phase-controlled and -modulated, standing-wave laser field focused on a cloud of cold $^{85}$Rb Rydberg atoms. The method is based on the ponderomotive (${\bf{A}}^2$) interaction of the Rydberg electron, which has less-restrictive selection rules than electric-dipole couplings, allowing us to probe both $nS_{1/2}\rightarrow nP_{1/2}$ and $nS_{1/2}\rightarrow (n+1)S_{1/2}$ transitions in first-order. Without any need to increase laser power, third and fourth-order sub-harmonic drives are employed to access Rydberg transitions in the 40 to 70 GHz frequency range using widely-available optical phase modulators in the Ku-band (12 to 18 GHz). Measurements agree well with simulations based on the model we develop. The spectra have prominent Doppler-free, Fourier-limited components. The method paves the way for optical Doppler-free high-precision spectroscopy of Rydberg-Rydberg transitions and for spatially-selective qubit manipulation with $\mu$m-scale resolution in Rydberg-based simulators and quantum computers.

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