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arXiv · 1711.02645

Sub-kHz excitation lasers for Quantum Information Processing with Rydberg atoms

R. Legaie·C. J. Picken·J. D. Pritchard
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Abstract

Quantum information processing using atomic qubits requires narrow linewidth lasers with long-term stability for high fidelity coherent manipulation of Rydberg states. In this paper, we report on the construction and characterization of three continuous-wave (CW) narrow linewidth lasers stabilized simultaneously to an ultra-high finesse Fabry-Perot cavity made of ultra-low expansion (ULE) glass, with a tunable offset-lock frequency. One laser operates at 852~nm while the two locked lasers at 1018~nm are frequency doubled to 509~nm for excitation of $^{133}$Cs atoms to Rydberg states. The optical beatnote at 509~nm is measured to be 260(5)~Hz. We present measurements of the offset between the atomic and cavity resonant frequencies using electromagnetically induced transparency (EIT) for high-resolution spectroscopy on a cold atom cloud. The long-term stability is determined from repeated spectra over a period of 20 days yielding a linear frequency drift of $\sim1$~Hz/s.

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R. Legaie, C. J. Picken, J. D. Pritchard. 2017-11-07. Sub-kHz excitation lasers for Quantum Information Processing with Rydberg atoms. https://doi.org/10.1364/josab.35.000892

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