Rapid high-purity loading of barium ion via relayed selectivity from naturally abundant source

Abstract

Trapped ions is one of the promising platforms for realizing quantum information processing and quantum simulation. Selective and rapid loading of a specific isotope lays the critical foundation for such purpose particularly when scaling up the system size. Here we demonstrate a new method for rapid isotope-selective loading of ${}^{137}{\mathrm{Ba}}^{+}$ or ${}^{135}{\mathrm{Ba}}^{+}$, two types of promising ion qubits, from naturally abundant source using a three-step, ultraviolet-free photoionization scheme. Neutral atoms are selected on the narrow 791 nm $6s^2{}^1{S}_0\to 6s6p{}^3{P}_1^o$ transition, resonantly transferred at 554 nm to $6s6d{}^3{D}_1$, and ionized using an existing 532 nm Raman beam. A spectral-overlap analysis based on isotope and hyperfine shifts shows relayed selectivity that the second step can further suppress undesired-isotope excitation and no contaminant ion is detected during our entire experiment. Besides, the resonant drive of the second step excitation yields a prominent loading rate of the selected species. This strategy using multi-step excitations to establish relayed selectivity can be extended to high-purity loading of other species of ions.

arXiv comment16 pages, 4 main-text figures and 7 supplemental figures, including Supplemental Material