Preparation of circular Rydberg states in helium using the crossed fields method

Abstract

Helium atoms have been prepared in the circular $|n=55,\ell =54,m_{\ell }=+54⟩$ Rydberg state using the crossed electric and magnetic fields method. The atoms, initially travelling in pulsed supersonic beams, were photoexcited from the metastable $1s2s{}^3{S}_1$ level to the outermost, $m_{\ell }=0$ Rydberg-Stark state with $n=55$ in the presence of a strong electric field and weak perpendicular magnetic field. Following excitation, the electric field was adiabatically switched off causing the atoms to evolve into the circular state with $m_{\ell }=+54$ defined with respect to the magnetic field quantization axis. The circular states were detected by ramped electric field ionization along the magnetic field axis. The dependence of the circular state production efficiency on the strength of the excitation electric field, and the electric-field switch-off time was studied, and microwave spectroscopy of the circular-to-circular $|55,54,+54⟩\to |56,55,+55⟩$ transition at $\sim 38.5$~GHz was performed.

arXiv comment10 pages, 8 figures

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• Excitation and characterization of long-lived hydrogenic Rydberg states of nitric oxide
• Microwave spectroscopy of the $1\mathrm{s}n\mathrm{p}{}^3{\mathrm{P}}_J$ fine structure of high Rydberg states in ${}^4$He
• Matter-wave interferometry with atoms in high Rydberg states
• Determining Absolute Neutrino Mass using Quantum Technologies
• Evaporative cooling to a Rydberg crystal close to its ground state
• Transport on flexible Rydberg aggregates using circular states