Cavity-enhanced Ramsey spectroscopy at a Rydberg-atom-superconducting-circuit interface

Abstract

The coherent interaction of Rydberg helium atoms with microwave fields in a $\lambda /4$ superconducting coplanar waveguide resonator has been exploited to probe the spectral characteristics of an individual resonator mode. This was achieved by preparing the atoms in the 1s55s${}^3$S${}_1$ Rydberg level by resonance enhanced two-color two-photon excitation from the metastable 1s2s${}^3$S${}_1$ level. The atoms then travelled over the resonator in which the third harmonic microwave field, at a frequency of ${\omega }_{\mathrm{res}}=2\pi \times 19.556$ GHz, drove the two-photon 1s55s${}^3$S${}_1\to$1s56s${}^3$S${}_1$ transition. By injecting a sequence of Ramsey pulses into the resonator, and monitoring the coherent evolution of the Rydberg state population by state-selective pulsed electric field ionization as the frequency of the microwave field was tuned, spectra were recorded that allowed the resonator resonance frequency and quality factor to be determined with the atoms acting as microscopic quantum sensors.

arXiv comment5 pages, 4 figures

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Cited by in corpus (3)

• Interfacing Rydberg atoms with a chip-based superconducting microwave resonator using an ac-Stark-shifted single-photon transition
• A superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms
• Comment on "Matter-wave interferometry with helium atoms in low-$l$ Rydberg states''