Barium autoionization for efficient ion trap loading

Zachary J. Wall; Justin D. Piel; Samuel R. Vizvary; Michael Bareian; Steven Diaz; Elijah Mossman; Anthony Ransford; Chris H. Greene; Eric R. Hudson; Wesley C. Campbell

doi:10.1103/c5m6-kt93

Barium autoionization for efficient ion trap loading

Zachary J. Wall ^1,*, Justin D. Piel ², Samuel R. Vizvary¹, Michael Bareian ¹, Steven Diaz¹, Elijah Mossman¹, Anthony Ransford ³, Chris H. Greene ², Eric R. Hudson^1,4,5 et al.

Wesley C. Campbell ^1,4,5

¹Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA
²Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
³Quantinuum, LLC, 303 South Technology Court, Broomfield, Colorado 80021, USA
⁴Challenge Institute for Quantum Computation, University of California Los Angeles, Los Angeles, California 90095, USA
⁵Center for Quantum Science and Engineering, University of California Los Angeles, Los Angeles, California 90095, USA

^*Contact author: zwall@physics.ucla.edu

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Phys. Rev. A 114, 013102 – Published 6 July, 2026

DOI: https://doi.org/10.1103/c5m6-kt93

Abstract

We report a theoretical and experimental investigation of autoionizing resonances from the $5 d 6 p {}^{3}D_{1}^{o}$ manifold in neutral barium for efficient loading of ion traps. Our calculations predict large resonant cross sections for many narrow autoionizing resonances, but we find experimentally that, for most of these, Doppler broadening during trap loading depresses the effective cross sections that can be achieved in practice. We identify and demonstrate a strong, broad transition at $530.8 nm$ and show that it furnishes an order-of-magnitude increase in trap loading efficiency compared to other demonstrated resonances.

Physical Review A

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Barium autoionization for efficient ion trap loading

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Barium autoionization for efficient ion trap loading

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