Spectroscopy of a synthetic trapped ion qubit

Abstract

${}^{133}{\text{Ba}}^{+}$ has been identified as an attractive ion for quantum information processing due to the unique combination of its spin-1/2 nucleus and visible wavelength electronic transitions. Using a microgram source of radioactive material, we trap and laser-cool the synthetic $A$ = 133 radioisotope of barium II in a radio-frequency ion trap. Using the same, single trapped atom, we measure the isotope shifts and hyperfine structure of the $6^2{\text{P}}_{1/2}$ $\leftrightarrow$ $6^2{\text{S}}_{1/2}$ and $6^2{\text{P}}_{1/2}$ $\leftrightarrow$ $5^2{\text{D}}_{3/2}$ electronic transitions that are needed for laser cooling, state preparation, and state detection of the clock-state hyperfine and optical qubits. We also report the $6^2{\text{P}}_{1/2}$ $\leftrightarrow$ $5^2{\text{D}}_{3/2}$ electronic transition isotope shift for the rare $A$ = 130 and 132 barium nuclides, completing the spectroscopic characterization necessary for laser cooling all long-lived barium II isotopes.

References in corpus (5)

• High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit
• Manipulation and Detection of a Trapped Yb+ Ion Hyperfine Qubit
• Modular Entanglement of Atomic Qubits using both Photons and Phonons
• Laser-cooling-assisted mass spectrometry
• Frequency metrology on the 4s 2S1/2 - 4p 2P1/2 transition in the calcium ion for a comparison with quasar data

Cited by in corpus (12)

• Laser Spectroscopy for the Study of Exotic Nuclei
• Noisy intermediate-scale quantum computers
• Opportunities for Fundamental Physics Research with Radioactive Molecules
• Time-Sliced Quantum Circuit Partitioning for Modular Architectures
• Improved isotope-shift-based bounds on bosons beyond the Standard Model through measurements of the ${}^2$D${}_{3/2}{-}^2$D${}_{5/2}$ interval in Ca${}^{+}$
• Laser Cooling of Radium Ions
• Entanglement between a trapped ion qubit and a 780-nm photon via quantum frequency conversion
• Isotope-Selective Laser Ablation Ion-Trap Loading of ${}^{137}{\mathrm{Ba}}^{+}$ using a ${\mathrm{BaCl}}_2$ Target
• Ablation loading of barium ions into a surface electrode trap
• Theoretical characterisation of the barium II and radium II ions
• Laser Cooling and Hyperfine Measurements of Radium-225 Ions
• Non-invasive mid-circuit measurement and reset on atomic qubits